 are numerous distinct lines of growth, which on the second whorl are like minute radiating spokes, and in the superior sinus (i. e. between
the suture and the first spiral) are sharp and distinct, and more remote than elsewhere on the surface, except on the base round the umbilicus, where, though less sharp, they are even more distinct.

Colour:  a dead chalky white, with an exquisite pearly nacre below the outside layer and within the shell.

The spire is low and scalar. The apex is flattened, the embryonic 1½ whorl, though somewhat tumid and large for the genus, being somewhat immersed. The 7 whorls show a regular and slow increase until the last, which increases somewhat more rapidly. Angulated above, tumid on the base, where (unlike Carenzia carinata (Jeffreys, 1877)) the edge of the umbilicus is the most projecting part. The suture is linear, very minute, but defined by a very slight shelf, which projects horizontally just below it. The aperture is perpendicular, squarish, buttoo much broken for description. The lines of growth on the outer lip show it to have the same three sinuses as those described in Seguenzia formosa Jeffreys, 1876. The columellar margin is patulous, a little reverted, scarcely twisted, with a broad deep sinus above, a strong, but not sharp, twisted tooth projecting at about three fourths of its length, below which is a smaller sinus running out into a point at the extreme end of the columella. The umbilicus is large, funnel-shaped, and deep. It is sharply defined by the edge of the base, the spiral of which runs out to the point of the columellar margin. Within the umbilicus is a strongish undefined spiral furrow answering to the columellar tooth, and the lines of growth are strongly defined.

Distribution
This species occurs in the Atlantic Ocean off the Azores and in the Gulf of Mexico, off Puerto Rico.

References

 Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels
are numerous distinct lines of growth, which on the second whorl are like hour radiate spokes, and in the superior sinus (i. e. between 
 the suture and the beginning spiral) are sharp and clear-cut, and more outback than elsewhere on the surface, except on the foundation round the umbilicus, where, though less astute, they are even more distinct. 

 Colour:   a dead calcareous white, with an exquisite pearly nacre below the outside layer and within the shell. 

 The spire is abject and scalar. The apex is flattened, the embryonic 1½ whorl, though reasonably tumid and large for the genus, being somewhat immersed. The 7 whorls prove a regular and slow increase until the last, which increases slightly more rapidly. Angulated above, tumid on the base, where (unlike Carenzia carinata (Jeffreys, 1877) ) the edge of the umbilicus is the most projecting part. The suture is linear, very minute, but defined by a very slight shelf, which projects horizontally just below it. The aperture is perpendicular, squarish, buttoo a lot break for description. The lines of emergence on the out lip show it to have the like three sinuses as those trace in Seguenzia formosa Jeffreys, 1876. The columellar margin is patulous, a short reverted, scarcely twisted, with a broad deep sinus above, a firm, but not sharp, twisted tooth projecting at about three fourth of its length, below which is a little fistula running out into a point at the extreme end of the columella. The navel is large, funnel - shaped, and deep. It is sharply defined by the edge of the base, the spiral of which runs out to the compass point of the columellar margin. Within the navel is a strongish undefined spiral furrow answering to the columellar tooth, and the lines of growth are powerfully defined. 

 Distribution 
 This species occurs in the Atlantic Ocean off the Azores and in the Gulf of Mexico, off Puerto Rico. 

 References 

  Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed .) (2001). European register of nautical species: a check - list of the nautical species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels
 arf numerous distinct liner of growth, whiey on tie secohd whorl are like minute radiating s'okew, and in the superior sinus (i. e. betwven
the surure qnd the ficat spiral) are dhar' end distinct, anc more remmte than elsewvefe on the surface, except on the base wound tne umbilicus, whete, thptgh mvsw sharp, they are even more diatinct.

Cmlour:  a dead chalky white, with an exqulsitf pearly nacre bellw the outsude jqyer and witfin the shtln.

The spire is low and scalar. The apex is wlattzned, the emvrtonlw 1½ whorl, thiugh fomewhat tumlc and narge fpr the genus, bcing vomwwhat immersed. The 7 wiorls show a regular and slow iucrease until the lasr, qhich incseasdw sumeshet jore rwpivly. Angulatsd above, tunid on the base, whete (lmlike Carenzja carynwta (Jeffreys, 1877)) the edge of the umbilicus is the most projecting paet. The suture is linewr, very mynute, but defined by a very slight shelf, which prmjecta hoxldontxolj just below it. The aperture is perpendicular, aqiagish, buttoo much nroken for descripyiln. Jhe lines of gtowth ou tge outer lip show lt to hwve tye same trree sinuses as those described in Seguenzic firmosa Jeffreys, 1876. Tke columellax margon is patulous, a little revexted, sdarcely twidted, with x broad deep sinjs sbmve, a strong, but not sharp, twisted vooth projecging at abjut three vourtmv of its length, bepow wkich hs a smallfr sinus running out into a poiiv at the extrgme eng of the colukella. The umbylicus is largg, funnel-skaped, xnd deep. In is shar'ly defined fy the edge ox the base, thx spiral jf wyich runs ojg to the point of the columellar nargin. Within the mmbilkdus is a strongnry undefined spital fuwrlw agvwering to tve culuorllar tooth, and bhe linrs of growth are strmnglg defined.

Distributook
This spexies occtrs in the Atkantic Ocean off tje Azmrer and in the Gulf of Mexico, off Puerto Rico.

Refegenges

 Gofas, S.; Lq Rekard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). Enropean register of matine species: a check-lnsu of the mariie spesies in Egrope and a bibliogrqphy of guides to their identification. Collewtion Patrimoines Naturels
are numerous distinct lines of growth, which second are like radiating spokes, and e. the suture and first spiral) are and distinct, and more remote than on the surface, except on the base round the umbilicus, where, though less they are even more distinct. Colour: a dead chalky white, with an exquisite nacre the layer within the shell. The spire is low and scalar. The apex is flattened, the embryonic 1½ though somewhat tumid and large for the genus, somewhat immersed. The 7 show a regular and slow until last, which somewhat rapidly. above, tumid on base, where (unlike Carenzia carinata (Jeffreys, 1877)) the edge of the umbilicus is the most projecting part. suture is minute, but by very shelf, which projects below it. The aperture is perpendicular, broken for description. The lines of growth on outer lip it to have the same three as those described in Seguenzia formosa Jeffreys, 1876. columellar margin is patulous, a little reverted, scarcely twisted, with a broad deep sinus above, but not sharp, twisted projecting at about fourths its below is a sinus running out into a point at the extreme end of columella. The umbilicus is large, funnel-shaped, and deep. It is by edge of the the spiral of which out the point of the Within umbilicus undefined furrow to the columellar tooth, the lines of growth are defined. Distribution This species off the Azores and in the Gulf of off Puerto Rico. References Gofas, S.; Le J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). register of a check-list of the marine species in Europe a bibliography of guides their identification. Collection Patrimoines Naturels
 are numerous distinct lines oF growth, whiCh on tHe sEcoNd WhorL are Like minute radiATing Spokes, and in the superior Sinus (I. e. BEtweEN
tHe sutUre and tHE fIRSt sPiRaL) arE sHArP and dIstInct, and More remote ThaN eLsewhere on thE SuRface, excepT on The base round The UmbiliCuS, whERe, thoUgh Less sHarp, thEY are evEn more disTiNCt.

ColoUR:  a dead cHALkY whiTe, with an exquisite PEaRLy nacre below thE outsiDe LAyER And WitHin the shelL.

THe spiRE is low aND sCALAr. THE apex is flatteNed, the embryONic 1½ Whorl, tHoUgh SOmewhaT tumiD aND laRge for the geNus, bEing somewHat immERsed. The 7 WHorls shOw a regUlaR anD sloW InCrEasE uNTil THe LasT, WhiCh increaSeS sOmewhAt moRE RAPidlY. AnGulaTed abOve, tumid on the BasE, wheRE (unLike CArenzIa caRiNata (JEffreyS, 1877)) the eDgE of the umbilicus Is thE most projEctInG paRt. the suTUre is lIneAr, vEry minuTe, but deFIneD bY A VErY slight shelf, which pRoJECtS horizonTally jUSt BeLOw it. The aPeRtuRe is PERpendIculAR, sQuarish, bUttoo mUCh BrOken for DeScriptIoN. ThE liNes of GRowtH on the Outer lip Show iT To have the same tHRee sinuses as tHOsE DEsCRibeD in seguenzia foRmosA jeffReys, 1876. tHe ColUMellaR margIn IS pATulous, a little revertEd, ScarceLy twiSted, with a broaD deep sinus ABOVe, a stronG, but NOt SHarp, twisted tooTh proJecting at aBOut three FourtHs of its lEngth, beloW WHich is a sMalLer SinUs rUNNiNg out into a poiNT At thE eXtreme eNd oF the colUmeLla. the UmbIlIcus is larGe, funnel-ShApEd, AnD deEp. It iS Sharply dEfIneD bY thE edge OF the baSe, the SpirAl Of WHicH runs ouT To THE poiNt Of The cOluMeLlar mArgiN. witHin the uMbilicus iS a sTRongIsH uNdefineD spiral furrow AnSwering to tHe ColUmellaR TOoth, and tHe lines of growth are stronGLy definEd.

DIstriButiOn
This speCieS occurS in THe AtlaNtic OcEan ofF tHe AZORes anD IN tHe GUlF of Mexico, oFF pueRto RiCo.

refeRences

 GOfas, S.; Le Renard, J.; BoucHEt, P. (2001). mollusca, in: CosTelLo, M.J. ET Al. (ed.) (2001). EURoPEan ReGIstER Of marine species: A check-list Of THe Marine specIEs iN EUrope anD a bibliOgrapHY of guidEs to their IdentificAtIon. COLLecTion PatrimOines NatUrels
 are numerous distinct lin es of grow th, w hic h o ntheseco nd whorl are l i ke m inute radiating spokes , and  i n  the su perio r sinus (i . e.be tw een 
t h esutur e a nd thefirst spir al)  a re sharp and di stinct, an d m ore remote t han  elsew he reo n the  su rface , exce p t on t he base r ou n d theu mbilicu s ,  w here , though less sha r p, they are evenmore d is t in c t .
Col our:  a de ad  chal k y white ,  w i t h  an exquisite pea rly nacre b e low  the o ut sid e  layer  andwi t hin  the shell. 

Th e spire i s lowa nd scal a r. Theapex i s f lat tene d ,th e e mb r yon i c1½w hor l, thoug hso mewha t tu m i d andlar ge f or th e genus, bein g s omew h atimmer sed.The7whorl s show  a re gu lar and slow in crea se untilthe  l ast ,which increa ses  so mewhatmore ra p idl y. A n gu lated above, tumid  o n th e base,where( un li k e Carenz ia  ca rina t a  (Jef frey s ,1877)) t he edg e  o fthe umb il icus i sthe  mo st pr o ject ing pa rt. Thesutur e  is linear, ve r y minute, but de f i ne d  bya v ery slightshel f , wh ichp ro jec t s hor izont al l yj ust below it. The a pe rtureis pe rpendicular,squarish,b u t too much  bro k en for descriptio n. Th e lines of growth o n the  outer l ip show i t to havethe  sa methr e e  s inuses as tho s e  des cr ibed in  Se guenzia  fo rmo saJef fr eys, 1876 . The co lu me ll ar  ma rgini s patulo us , a  l itt le re v erted,  scar cely  t wi s ted , witha  b r o ad d ee psinu s a bo ve, a  str o ng,  but no t sharp,twi s tedto ot h proje cting at abou tthree four th s o f itsl e ngth, be low which is a smallers inus ru nni ng ou t in to a poin t a t theext r eme en d of t he co lu mel l a . The u mb ili cu s is large , fun nel-s ha ped,  and de ep. It is sharplyd efi ned by the ed geof t h e  b ase ,  t h e s pi r alo f  which runs out  to the po in t  o f the colu m ell ar  margin . Withi n the umbilic us is a s trongishun defi n e d s piral furr ow answe ring to t h e col u me llartoo th, an dthe  line s of g r owt h are  stron gl y defi ned.
D istribut ion
This species occurs  in th e Atl ant ic Oceanoff the  Azores a nd i n the Gulf  of  Me xico,  of f  Puer to R i co .
R efere nces 
 Gofas,S .;  Le R en ard, J.; Bo u c h et,  P. ( 200 1 ). Mol lusc a, in: Costello,M .J. et al. (Ed .) ( 2 0 01) . E u rope an  register of m ari ne s pecies:acheck-listof the m ar i ne sp eciesin Eur ope and a  b i bliogr aphy  of  guides t o t he i r ident if ic a tion.Coll ec tion P atrimo i nesN a turels
 are_numerous distinct_lines of growth, which_on the_second_whorl are_like_minute radiating spokes,_and in the_superior sinus (i. e._between
the suture and_the_first spiral) are sharp and distinct, and more remote than elsewhere on the surface,_except_on the_base_round_the umbilicus, where, though less_sharp, they are even more_distinct.

Colour: _a dead chalky white, with an exquisite pearly_nacre_below the outside_layer and within the shell.

The spire is low and_scalar. The apex is flattened, the_embryonic 1½ whorl,_though_somewhat_tumid and large for_the genus, being somewhat immersed. The_7 whorls show a regular and_slow increase until the last, which increases_somewhat more rapidly. Angulated above, tumid_on the base, where (unlike_Carenzia carinata_(Jeffreys, 1877)) the edge of_the umbilicus is_the most_projecting part. The_suture is linear, very minute, but_defined by a_very slight shelf, which projects horizontally_just_below it. The_aperture_is_perpendicular, squarish,_buttoo much broken_for_description. The_lines_of growth on the outer lip_show_it to have the same three sinuses_as those described in_Seguenzia_formosa Jeffreys, 1876. The_columellar margin is patulous, a_little reverted, scarcely twisted, with a_broad deep_sinus above,_a strong, but not sharp, twisted tooth projecting at about three_fourths of its length, below which_is a smaller sinus_running out_into_a point at_the_extreme end_of the columella. The umbilicus is large,_funnel-shaped, and_deep. It is sharply defined by_the edge of the_base,_the spiral of which runs out_to the point of the columellar_margin. Within the umbilicus is_a_strongish_undefined spiral furrow answering to_the columellar tooth, and the lines_of growth are_strongly defined.

Distribution
This species occurs in the Atlantic_Ocean_off the Azores and in the_Gulf_of Mexico, off Puerto Rico.

References

 Gofas,_S.;_Le_Renard, J.; Bouchet, P. (2001)._Mollusca, in: Costello, M.J. et al._(Ed.) (2001). European register of marine species: a check-list_of the marine_species in Europe and a_bibliography_of_guides to their identification. Collection Patrimoines Naturels