VENUS, 



Plate VII. 



Species 31. (Mus. Cuming.) 



Venus lenticul.\ris. Veti. tedd quadmlo-orbkulari, 

 valde iiiaqiiilaterali, crassd, depresm, sordide cnlcareo- 

 alba, concentrice dense rude striata, striis irregularibiis, 

 latere postico sulflexuoso. 



The lens-shaped Venus. Shell squarely orbicular, 

 very inequilateral, thick, depressed, duU chalk-white, 

 densely concentrically rudely striated, strife irregular, 

 posterior side slightly flexuous. 



Sowerby, Pro. Zool. See. 1835, p. 42. 



Hab. Valparaiso Bay (in coarse sand, at low water) ; Cu- 

 ming. 



A dull-white heavy shell, almost smooth, witli the pecu- 

 liar depressed quadrately orbicular form of Arteiim. 



Species 32. (Pig. a, b, Mus. Cumiug.) 



Venus discors. Ven. testa oblique ovatd, depressiiisculd, 

 albidd, violaceo-fusco plus minus thictd, radiatim pro- 

 fuse plano-liratis, liris posiice anf/ulatis, liris anticis 

 decussafim crenatis. 



The differing Venus. Shell obliquely ovate, rather 

 depressed, whitish, more or less stained with violet- 

 brown, radiately profusely flatly ribbed, ridges angled 

 along the posterior edge, anterior ridges decussately 

 crenated. 



Sowerby, Pro. Zool. Soc. 1835, p. 43. 



Tapes discors, Sowerby Junr. 

 Hab. St. Elena and Guacamayo, Central America (in sandy 

 mud at six to nine fathoms) ; Cuming. 



The concentric ridges by which the anterior radiating 

 ridges are crenated cease rather abruptly at a distance, 

 from the interior extremity, of rather more than a third 

 of the shell. 



Species 23. (Mus. Cumiug.) 



Venus eugosa. Ven. testa subgloboso-cordatd, ventricosd, 

 fulm-spadiced, roseo-fuscescente obscure tinctd et ma- 

 culatd, concentrice undique valide costatd, costis regu- 

 laribus, laminato-recurvis, interstitiis excavatis, cris- 

 pato-indentatis et striatis. 



The wrinkled Venus. Shell somewhat globosely heart- 

 shaped, ventricose, fulvous-drab, obscurely tinged 

 and spotted with rose-brown, strongly concentrically 

 ribbed throughout, ribs regular, lamiuately recuiTed, 

 interstices excavated, crisply indented and striated. 



Gmelin, Syst. Nat. p. 3276. 

 Venus ciucta, Chemnitz. 

 Venus riyidu, Dilhvyn. 



Hub. West Indies. 



A globose heart-shaped shell, ribbed with great regula- 

 rity, the ribs being smooth, laminately curved over to- 

 wards the umboes. 



AprO, 1863. 



