﻿CYRENA.— Plate XIX. 



tnmid, thick, smooth, covered with a pale yel- 

 lowish shining epidermis ; anterior side short ; 

 posterior side produced, rather attenuated, 

 angular, rather flattened in front of the angle ; 

 dorsal margin sloped, terminal margin biangular, 

 truncated. 



Deshates. Proc. Zool. 1854, p. 21. 



Hah. ? 



Species 113. (Mus. Sowerby.) 

 Ctrena Buschii. Cyr. testa veneriformi, ovatu-mblri- 

 yond, solidd, suleompressd, epidermide fusco- 

 flavidd fimhriathit Mrint," indutd ; latere antico 

 hrevi, prope marf/hiciu ihusn-lfittralem planulato ; 

 latere postico maijis iinnhh-io, margine dorso- 

 laterali arcuato ; umhimibu-s elevntis, vermis Intiis 

 anticum inclinatis. 

 Von Busch's Ctrena. Shell venus-shaped, ovately 

 subtrigonal, solid, rather compressed, covered 

 with a brownish-yellow epidermis ; anterior side 

 short, flattened near the dorso-lateral margin ; 

 posterior side more produced, dorso-lateral 



margin arched ; umboes raised, leaning towards 



the anterior margin. 



PniLipri ? Adams' Genera. 



Lauta. Deshayes. 

 Hah. ? 



Species 114. (Mas. Brit.) 



Cteena .eqhilateealis. Cyr, testa suhtrigcmd, com- 

 jiressd, altcl, suhcequilaterali, fulvo-subatirantid, 

 Icevigatd ; latere antico hreviusculo, declivi, infra 

 icmhones excavato ; latere postico ptaulh magis 

 prodiuito, infra acuminato, prope marginein dorso- 

 lateralem angulato. 



The equilateeal Cyeena. Shell rather trigonal, 

 compressed, high, nearly equilateral, fulvous 

 orange, smooth ; anterior side rather short, 

 sloped, hollowed under the umboes ; posterior 

 side a little more produced, acuminated below, 

 vrith an angle near the dorso-lateral margin. 



Deshates. Proc. Zool. Soc. 1854. p. '2U. 



Hah. Cayenne. 



