727 



laminatum productis; margine dorsali planulatim excavato; lu- 

 nula fusca, substriata ; margine ventrali intus crenulato. 



This shell has much the general appearance of V. cassina, of 

 which it may, after all, be only an abnormal form ; the concentric 

 ribs however are all closely decumbent and rounded, excepting 

 at the sides, where they are irregularly interrupted and some of 

 them thickened; at the back some of them are produced into 

 thick laminated lobes. 



Senegal. 



71. Venus verrucosa (pi. clx. f. 182, 183), Linnaeus, 

 Syst. Nat. 12th edit. p. 1130. Venus erycina, Pennant. Pec- 

 tunculus strigosa, Da Costa. Test. jun. V. cancellata, Donovan. 

 V. Lemanii, Payraudecm, Moll. Corse. 



V. testa oblique rotundata, alba vel pallide fulva, fusco lite- 

 rata ; laminis concentricis duplicatis, rugosis, ad latera divaricatim 

 tuberculatis ; latere postico declivi ; margine dorsali excavato, valvar 

 sinistra lsevigato ; latere antico brevi ; margine ventrali elevato, 

 intus crenulato ; lunula striata, impressa. 



A series of diverging channels at the sides of the shell separate 

 the rough duplicate concentric laminae into wart-like tubercles, 

 and thus distinguish the species from V. cassina and others of the 

 same groxip. 



British and Mediterranean seas, and Senegal. 



72. Venus cor (pi. clx. f. 184), Sowerhy, jun. 



V. testa ventricosissima, rotundata, albida, epidermide tenui 

 fulva induta, Kris numerosis irregularibus subundulatis rotun- 

 datis cincta ; latere postico magno ; margine dorsali elevato ; 

 area depressa, striata; latere antico parvo, brevi, angusto, prope 

 umbones concavo ; lunula distincta nulla ; margine ventrali intus 

 lsevigato. 



I name this species from its remarkable resemblance to the 

 Isocardia of the same name ; the hinder side being very large and 

 inflated, the front small and hollow near the umboes ; the con- 

 centric riblets are numerous and small, rather irregular and undu- 

 lating ; dorsal margin simple, depressed ; lunule not defined ; inner 

 margin smooth. 



The unique specimen is Mr. Cuming's, from Kurachee, mouth 

 of the Indus. 



73. Venus agrestis (pi. clvi. f. 75, 76, copied), PAilippi, 

 Abbild. t. 4. f. 2. 



5 B 



