﻿C Y R E N A. 



Plate IV. 



Species 10. (Mus. Brit.) 



Ctrena INFLATa. Cijr. festA fumiclissimd, crassd, valde 

 incpquilatcraU, epidennide rugosd, crassd, nigra, 

 indutd, intiis versus marginem dense purpurea, ad 

 marginem nigrescenti; margine cardlnali lata, 

 fulcro latissimo, dente antico brevi, magna ; latere 

 antieo hrevi, angusto ; latere postico expanse, 

 injlato, ad marginem hiangulato ; margine dorsali 

 elevato. 



The inflated Cykexa. Shell very tumid, thick, 

 very inequilateral, covered with a rough, thick 

 black epidermis, deep purple within towards the 

 margin, deepening into black at the margin ; 

 cardinal margin broad, fulcrum very broad ; 

 anterior tooth short, large ; anterior side short, 

 narrow ; posterior side expanded, inflated, with 

 two angles at the margin ; dorsal margin raised. 



Prime. Proc. Zool. Soc. 18G0, p. 20. 



Hal. Nicobar Islands. 



Species 11. (Mus. Brit.) 



Cyrena Veneriformis. Cyr. testa ovaid, solidd, cas- 

 taned, tumidd ; intiis purpurea partim suffusd ; 

 latere antica brevi, declivi, fere usque ad medium 

 subregidariter lirato ; latere postico injlato, tumido, 

 ad marginem rotimdato ; umhonibus promi- 

 nent ibus. 



The Venos-shaped Ctrena. Shell ovate, solid, 

 chestnut, tumid, suffused with purple inside ; 

 anterior side short, sloped, rather regularly 

 ridged as far as the middle ; posterior side in- 



flated, tumid, rounded at tin- margin ; iiiiihncs 

 prominent. 



SOWERBT. 



Batissa fuscata. Prime. 



Cijrena fuscata of Lamarck belongs to the suction 

 separated by authors as a genus under the name 

 Corbicula. It is a very inconvenient practice, in 

 naming new shells, to repeat a name already applierl 

 to a species in what has recently been considered th(^ 

 same genus. 



Species 12. (Mus. Brit.) 



Ctrena producta. Cyr. testa magna, altd, sab- 

 rotundd, epidermide fusco-subviridi nitenli indutd, 

 media Icevigatd, utroque latere distanter sulcata ; 

 intiis rosed, dense purpurascenti, latere antico 

 brpi'i-ssimo, area depressd sublunulari, ad mar- 

 ginem sinuatd; latere postico subquadrato, mar- 

 gine dorsali elevato; umhonihus elevatis, pro- 

 minentibus, incurvis ; ligamento magna, brevi. 



The produced Cyrena. Shell large, elevated, rather 

 round, covered with a greenish brown shining 

 epidermis ; smooth in the middle, distantly 

 grooved on each side ; rose, shading into deep 

 purple within ; anterior side very short, sinuated 

 at the margin by a depressed Innule-like area ; 

 posterior side rather square, dorsal margin 

 elevated ; umboes raised, prominent, turned 

 inwards ; ligament large, short. 



Deshayes (Batissa). Proc. Zool. Soc. 1854, p. 13. 



Eab. ? 



