﻿CYRENA.— Plate XIV. 



epidermide loevigaiafuseo-subviridi, hit us violaced; 

 latere postico ollique producto, angulato, versus 

 marginem Icevigato ; latere antico hrevi, declivi, 

 infra umhones area Icevigatd lunulato ; timbonihus 

 productis. 



The Ctrenifoem Cteena. Shell thick, very high, 

 subtrigonal, tumid, rather oblique, distantly 

 wi'inkled, covered with a smooth, greenish-brown 

 epidermis, violet within ; posterior side obliquely 

 produced, angular, smooth towards the margin ; 

 anterior side short, sloped, with a smooth 

 lunular area ; umboes produced. 



Peimb ? (Corbicula) MS. Brit. Mus. 



Hah. ? 



It would be better to avoid giving such specific 



names to species of very closely allied genera as 



cannot with propriety be used when the genera are 



considered as one. Such tautologies as the ' Cyrena- 



shaped Cyrena ' would not then occur. 



Species 70. (Mus. Hanley.) 

 Cteena sulcatixa. Cyr. testa suhtrigond, roseo-pur- 

 pured, altd, tenuissime sulcatd striatd, postice et 

 ad latera Irpvmsculd, epidermide stramined indidd, 

 iiitus purpurea marginatd; umhonibus elevatis, 

 margine dorsali idrinque deeUvi, infra umhones 

 area pallidd, planulatd ; anilca suhexcavatd ; 

 margine ventrali convexo. 



The fine-geooved Cteena. Shell subtrigonal, pur- 

 plish-pink, high, very finely groove-striated, 

 posteriorly and at the sides rather smooth, 

 covered with a straw-coloured epidermis, purple- 

 bordered within ; umboes elevated, dorsal mar- 

 gin sloped on each side with a pale, flattened 

 area, slightly excavated anteriorly ; ventral 

 margin convex. 



Deshates. Proc. Zool. Soc. London. 18G4. 



Hob. China. 



Species 71. (Mus. Brit.) 



Cteena geandis. Cyr. testd magna, uvato-suhtrigond, 

 irregulariter rugaid, suhcnmpressd, intus et ad 

 uinhoiies roseo-aurantid ; latere antico hrevi ; latere 

 postico acuniinato, angulato ; margine ventrali 

 valde convexo ; margine dorsali utrinque declivi. 



The large Cteena. Shell large, ovate-snbtrigonal, 

 irregularly wrinkled, compressed within and at 

 the umboes pinky orange ; anterior side short ; 

 posterior side acuminated, angular ; ventral 

 margin convex ; di 

 side. 



DESHATE.S ? MS. Brit. Mus, 



Hah. ? 



argin sloped on each 



About half way in character between C. Wuoil- 

 wardiana and the more beaked and acuminated 

 C. sim.ilis. 



