﻿C Y R E N A. 



Plate Xil. 



Species 51. (Fig. a, h, ilus. Brit.) 



Ctrexa cor. Cyr. iestd subtrigond, crasgd, tuniidd, 

 altd; aiirantio-fuscd, vel grised, purpureo-fasciald; 

 tenuiter-snlcatd ; siilcis versus marginem magis 

 numcro-'<is, ad latera evaniJis ; latere autieo hnri, 

 siipcrne excavato ; latere 2'ostico prodticto, aiigit- 

 lato, margine dorsali declivi, marghie terminali 

 tnuicnto ; inti'is alhd, medio purpured. 



The HE.A.RT CvKENA. Shell subtrigoual, thick, tumid, 

 high, OTOiige-brown, or grey, banded with purple, 

 finely grooved, grooves more nnmerons towards 

 the margin, fading otf at the sides ; anterior side 

 short, excavated above ; posterior side produced, 

 angular, dorsal margin sloped, terminal margin 

 truncated, white within, purplish in the middle. 



Lamarck. Anim sans Vert. 



Cijrena voiisolirina. Deshayes. 



Hub. River Euphrates, (small var.) 



Species o2. (Mus. Brit.) 

 Cyrena rhomboidea. Cijr. tentd ovato-mUrignnd, sub- 

 depressd, superne regulariter rugitld, verfiix mar- 



guiem 



Im-iihculd, late 



mint,, 



augulum complnnato, niargiio ilmsitl i Jerliri, Inf, n: 

 aidico brevi ; umboiiibus eleridi<, tuilniciintiuati.^, 

 margine ventrali rectiiisculo. 



The RHOMBOiDAL Cyresa. Shell ovate, subtrigonal, 

 subdepressed, regularly wrinkled above, rather 

 smooth towards the mai'gin, posterior side an- 

 gular, flattened behind the angle, dorsal margin 

 sloped ; anterior side short ; umboes raised, 

 rather raised, slightly acumiuated, ventral mar- 

 gin rather straight. 



Prime. Catalogue of Corbicuhr, 3, 18G3. 



Hal. Jtlalacca. 



Species 53. (Mus. Brit.) 

 Cyhena Cumixgii. Cyr. testa snbocatd, iiijlatd, temii, 

 subaurantid, Kris distantibiis, aciitis, hinc-illic 

 concurrentibus rugafd ; latere autieo brevi, sub- 

 rotundo ; latere postico producto, leviter angidato, 

 ad temdnum truncato, margine dorsali decliui. 



Cl'MING's Cyke.na. Shell rather oval, inflated, thin, 

 ratlier oraugo, wrinkled with dislinil , sliav|i. hrre 

 and there coucurrent ridges; and rmi' siilr simrt, 

 rather round ; ])osterior side pniiiurcil, sli^litly 

 angular, triinratcil at the end; dor.sal margin 

 sloped. 



Deshayes. 



Hab. Philippines. 



Species 5t. (F. a, b, JIus. Hanley.) 



Cyuena okiextai-is. Cyr. tesid sulidd, subtrigoiid, altd, 

 liris cra.isis, rotumlis, rngatd, epidermide )iiteiiti, 

 auratitio-dlivaced, nigresaenti, indutd, intiis pur. 

 jiiiri-d : lalrrr aidicu breviihculo, margine laterali 

 ilri-liri: Jiilrrr jiostico ungulato, voldh dedlivi, ad 

 trni,ii,iu„ tnnieato. 



TuE ORiEX'i-AL Cyuena. Shell solid, subtrigonal, high, 

 wi'inkled with thick, ronnded r-dges ; covered 

 with a shining orange-olive blackish epidei-mis, 

 purple witliiu, anterior side i-ather short, lateral 

 margin sloped, posterior side angular, much 

 sloped, truncated at the cud. 



Lamarck. 



Cyreiia jliiininalis. ]\Iiiller. 



Hab. India, (var./', b), Japan. 



Species 55. (Mus. Brit.) 



Cyuena Toeohamensis. Cyr. testa oeatd, solidd, sidide- 

 pressd, subdistanter concent ri.-r Jir.ild ,• ,pid,;;,ude 

 nitenti, crassd, uigresceuti iinlnt,!, intiis jinrpiired ; 

 latere antico Ijreivissimo ; latere postio' angidato, 

 obliqui; truncato, suhacuminato. 



The Yokohama Cyrena. Shell ovate, solid, rather de- 

 pressed, rather distantly concentrically ridged ; 

 covered with a thick, shining, blackish epider- 

 mis, purple within ; anterior side very short, 

 posterior side angular, obliquely truncated, 

 rather acumiuated. 



SoWEIiHY. 



Hab. Yokohama, Japan. 



