﻿C Y R E N A. 



(Fig. a, h, Mils. Brit.) 



I.'KNA CARDIFOKMLS. 



text, I lein 



'»/.;, 



nh. 



sulxh^t.nitrr .^Iriat,; ; hifcr /.,«//,■,. hrrrl, r.rrnn,/.,. 



,le,-i;n\ ,„l t.rniui,,,,, hnritt-r truncate; umh<nihus 

 iiij!iiJi>i, mhinilis: iti<u-:jhie oentrali conve.ro, jinqic 

 Ir-niiiiiuiii iiiidiciiiii ^iiiiilo coiicavo. 

 UKAKT-SHAPED Cyrena. Shell rather thin, sub- 

 trigonal, deep, inflated ; dull brown, sometimes 

 clouded with purple inside, outside concentrically 

 rather distantly striated ; posterior side produced, 

 slojied, shortly truncated at the end ; umboes 

 inflated, rounded ; ventral margin convex, a 

 little concave near the end. 



,[AYi:s. ? MS. in Cum. Coll. 



, Payta, Peru. 



Species 28. (Mas. Brit.) 



CviiENA IMVAKICATA. fz/r. feM,1 ^-m.s'.v,?, fllliujii'isnihl, 

 „;ijr,-sr,i,ti\ rnnrriifn'rr, lonhihiliiu, hilr slrnilu; 

 iatns ,,alUd: Ciirnru ; later,- ai.fio, /„■, r/s.v//,,.,, ,/,-. 

 rli'ri^subexcarate ; unthoiiibii,s defressis, fere termi- 

 iiallhus, latere pustico fumido, angnlato, post 

 (nii/idurn et paulb ante divaricaiini riu/ato, inanjine 

 ('nrsall urcuato. 



The iiivEHGENT Cyrena. Shell thick, rather funiid, 

 nearly black, with concenti'ie undulating broad 

 striio ; pale, fleshy within ; anterior side very 

 short, sloped, slightly escavated ; uniboes de- 

 pressed, almost terminal, posterior side tumid, 

 angular, behind and a little before the angle 

 divergently wrinkled ; dorsal mai'gin arched. 



Deshayes. Proc. Zool. Soc. 1874, p. 17. 



Hall. New Guinea. 



Species 29. (Mus. Brit.) 



Cyrena Panamaensis. Cijr. tesid injlah!. ,jl,ih, ,.<,!. nJld, 



fiisco-auhviridi, latere anticn xtihtn^ innlinicx rotund:' 



'cecuvato, infra roiumV,' j,rnd,<rln : „„ihn„il,i,s ,-/,■- 



vatif, rutundis; inar.jinr rnilmi; ronrr.m ; hiterr 



jm.-fin, a„,,lihito, ad amjuhu,, ,./,.s',v/,-/.«/,„r airiunt,,, 

 area postaiujularl cuiwatd, plannJata. 



The Panama Cyrena. Shell inflated, globo.se, high, 

 greenish-brown ; anterior side roundly excavated 

 under the umboes, roundly produced below ; 

 umboes elevated, round ; ventral margin convex ; 

 posterior side angular ; very obscurely keeled at 

 the angle, postangular area cornered, flat. 



Prime. ? MS. Mus. Brit. 



Ilah. Panama. 



Species ;30. (Mus. Brit.) 



Cyrena maritima. C///-. trsid in rial,!, snhqlohnxd, 



altissin,d, rj.id.ru. idr ,.ap.i,-a.-.d i..d„t.l \,.„r.nu 

 trice .■atrial.!; ....ir.ji.ir .h.,-sali ..tri.i.jnr dr.diri : 

 latere lu.^tl.:. aii.julal.,, ad a.i.jidu,., ..htnsi ca- 

 rinato; ninhonihiis roliuidin, injhiliti. 



The maritime Cyrena. Shell inflated, subglobose, 

 very high, covered with a papyraceous epi- 

 dermis, concentrieally sfil;de<l; dorsal margin 

 sloped on each siilc ; posfciidi' side angular, with 

 an obscure keel at tiic ;iiigli'; umboes rounded, in- 

 flated. 



C. B. Adams. Proc. Zool. Soc. 185-1, p. 3r.5. 



Hah. ? 



Species 31. (Fig. a and Fig. 6, c, PI. X. Mus. Brit. 

 and Sowerby.) 



Cyrena Caroliniensis. Cyr. testa altu, hrevi, tum>dd, 

 valde inftatii, e^iideriiiide riiiju.to-striafd, oli raced 

 vel pallidi; fill.:! i.idiitd, iiili'.x ^iil.tim ii.iil,..n.-^ 

 earned, ad i,U-ra.-a,-di.,r„„,„r,,„-,nr..,...,a.:dald 

 et r.idiatd : latrrr .mtir,. hrrri^<i,ii... ,lr,-Hri ; itiu- 

 h.uih,.^ .illis, h,.,.idi..pn,..,iii.'.itih.i,: latere jws. 

 tie,. l,it„. f.d.fr.,,,,;,!,.. i,„,i;,ii,r d.,r.-;,li d.:cliri. 



The Caromna Cyrena. Shell raised, short, tumid, 

 much inflated, covered with a roughly striated 

 olive or pale fulvous epidermis, fleshy within, 

 under the umboes spotted and rayed, with purple 

 at the sides and hinge ; anterior side very short, 

 sloped ; umboes high, tumid, prominent ; pos- 

 terior side broad, slightly truncated, dorsal 

 margin sloped. 



Bosc. Nich. Enc. Am. PI. I. f. Id. 



Hah. S. Carolina, N. America. 



