﻿CYRENA.— Plate XVII. 



Mullee's Cyrena. Shell rather round, very high, 

 tumid, deep purple witliiu and without, covered 

 ■with a greenish shining epidermis, wrinkled 

 with strong, distant ridges, some of them 

 running into each other ; umboes nearly central, 

 raised, dorsal margin sloped downwards on each 

 side. 



Prime. ? MS. Hanley's Collection. 



Hah. Fuh Chan, China. 



Species 90. (Mus. Hanky.) 



CyuenA LIMOSA. Cijr. ti'stii alti'i, oriifo.snJn-nfini.hi, 

 compressd, tenuiter liratd,ferii m<iiiihifrriij'i, hifiis 

 extusque pupured, epidermide suhririili vl iiiijri- 

 cant! Indufd; lati-rr .t„fir.,,inanip<jsticum hrevion, 

 inarfjiiio dorsah cnu r, ,,■,,-, I, rlii-; ; latere poMco 

 siibrotiindo^ manjiiii' ilnninll p:iidn elcvalo ; um- 

 bonibus versus latnx aidiiyiin- ijiclinntif^, niiinjiiie 

 ventrali convexo. 



The muddy Cyrena. Shell high, ovato-subrotund, 

 compressed, finely ridged, almost equilateral, 

 purple inside and out, covered with a greenish 

 or blackish epidermis ; anterior side shorter 

 than posterior, with dorsal margin convexly 

 sloped ; posterior side rather rounded, dorsal 

 margin a little raised ; umboes leaning towards 

 the anterior side, ventral margin convex. 



Maton. Hank'}', in Photographic Illustrations. 



IL^j La Plata. 



Species 07. (:^Ius. Brit, i 



Cyrena Modssoniaxa. Cyi: testa ovatd, sabcjmpressd, 

 t&imiusciild, medio liratd, ad latera IcBvigatd, 

 epidermide dense olivaced velflavidd indictd, infils 

 alhd : lufrrr mil',;, l>rrri, rotundo ; latere post! co 

 jir^uhirt.i: i,nii;jiiir 'tmxiili rectmsculo, 'paulo de- 

 rlirl. „i,n;jnir h,trn,Ji late tmncato. 



Mousson's Cyrena. Shell ovate, rather compressed, 

 rather thin, ridged in the middle, smooth at the 

 side.s, covered with a dark olive or rather yellow 

 epidermis, white within; anterior side short, 

 round, posterior side produced ; dorsal margin 

 rather straight, a little .sloped, lateral margin 

 broadly truncated. 



Deshates. ? MS. Brit. Mus. 



Eal. ? 



Species 98. (Mus. Brit.) 



Cyrena fragims. Ci/r. tesfd ohlor. 



'J' I, 



.pnstJcc 



dense sidn-u-i'd!, /;,■;..■ (?/./. !„/;/./rs- .<„h.,],i;.j 



cvanid;^. ,n.„:,,ili;, ,:, „,■„,■:-, ,j;hi,, ,■„,,.,/.!. ulfilS 

 alhd; latrrr aiillrn l,rrr,\ n,J,it ,:ml>n,i.:< ,,,r„vato : 

 latere postico ohloiiga, ■maryiit.e dursali leviter 

 declivi, margine terminali late, oblique truncate. 



The fragile Cyrena. Shell oblong, very thin, deep 

 greenish, wrinkled with distant, rather oblique 

 ridges disappearing posteriorly, some running 

 into each other, white witliin ; anterior side 

 short, hollowed beneath the umboes ; posterior 

 side oblong, dorsal margin slightly sloped, ter- 

 minal margin broadly, obliquely truncated. 



Desuayes. ? MS. Brit. Mus. 



Hub. ? 



Species 99. (Mus. Brit.) 

 Cyrena squalida. Cyr. testa tenui, ohlongd, depressd, 

 compressd, epiderviide sordide olivaced, vwlaceo- 

 nebulatd indutd, ad latera la-vigatd, inedio irregn- 

 lariter rugatd ; latere antien brevi, rotundo, infra 

 umhnnes excaoato, latere posticn prodncto ; margine 

 dcrsnh' dn-JIt!, iiinrijho: latrnili ulUqiw trnnciito, 



TilK s.iiAi.iD Cvi.'KNA. Shell thin, oblong, depressed, 

 compressed, covered with a dirty olive epidermis 

 clouded with violet, smooth at the sides, irregu- 

 larly wrinkled in the middle ; anterior side 

 short, rounded, hollowed under the umboes ; 

 posterior side produced, dorsal margin sloped, 

 lateral margin obliquely truncated, slightly 

 acuminated below. 



Desuayes. Proc. Zool. Soc. 18o4, p. 342. 



Hah. ? 



Species 100. (Mus. Brit.) 



Cyrena Salmacid^. Cyr. testa donaeiformi, tenui, 

 loiviyatd, albidd, purpureo-nebulatd ; latere antieo 

 alto, brevissimo, umbonibus acutis, margine dorsali 

 valde declivi, latere postico prodncto, acuminato. 



The Salmacidian (?) Cyeena. Shell donax-shaped, 

 thin, smooth, whitish, clouded with purple ; 

 anterior side high, very short ; umboes acute, 

 dorsal margin much sloped, posterior side pro- 

 duced, acuminated. 



MORELET ? MS. Brit. Mus. 



Hab. ? 



