﻿CTRENA— Plate XIII. 



Species Go. (Mns. Brit.) 



CtKENA WOODIANA. Cyr. If.-f,! .<„J„.r,i/,; . alt,!, nhliqiin, 

 ej^idermidr crasso, nilrn/i, ulicoi-cn-nhirirndti ^ <iii. 

 rantio-fasciafd inilnti'i, mrjiu dhlautrr nujald . 

 latere antieo hremssimo, margine dorso-latarali 

 valde declivi ; mnbonihus elevatis, margins ven- 

 trali valde convexo ; latere poslico produdo, angu- 

 lato, suiacuminato, margine venfrali sursiim ac- 

 cUvi, margine dorsali loiigc dccUvi. 



Wood's Ctrena. Shell subovate, high, oblique, 

 covered with a thick, shining, blackish-olive 

 epidermis, banded with orange, distantly wrm- 

 kled in the middle; anterior side veiy short, 

 dor^o-lateral margin much slojied ; umboes 

 I'aised, ventral margin very convex ; posterior 

 side produced, angnlar, slightly acuminated, 

 ventral margin sloped upwards, dorsal margin 

 with a long slope. 



Lea. Trans. Amer. Phil. Soc. 1832. 



Gyrena Prlmeana. Miirch. 



Hah. China. 



Cyrena .•sindlix, Gray, and Cyrena grandis, Deshayes, 



both resemble this species, which, however, is much 



more oval and higher than either. The first-named 



is a more triangular shell with a radiated angle, 



while the second holds a middle station between the 



other two. 



Species ('A. (Mus. Brit.) 



Cyi.'ENA SIMILIS. Ci/r. testa pondnru^d, <iiltri,inn,t. 

 fiiiiiiilii, irrrijulanter rvgatd, eju'dcrniidr f, rri'i/i. 

 ,11.1, Mrinld iiidutu; latere antieo hrcvl, lat, rr 

 dorsali declivi ; latere postiao prodiicto, acwninatu, 

 subrostrato, angulato, margins laterali Imig'e. di-- 

 clivi. 



The similar Ctrena. Shell ponderous, subtrigonal, 

 tumid, irregularly wrinkled, covered with a 

 ferruginous, striated epidermis ; antei-ior side 

 short, dorsal margin sloped downwards ; poste- 

 rior side produced, acuminated, somewhat 

 beaked, angular; dorsal margin with a long 

 slope. 



Gray. GrifEth's Cnvier. 1854. 



Hah. Philippines. 



See remark on the preceding species. 



Fig. 47, r. (Mus. Hanley.) 

 Cyrena radiata. Young. See Plate XI. for specie.s 



Fig. 48, b. (Mus. Brit.) 

 Cyrena occidexs var. See Plate XL for species. 



