71U 



19. Venus cancellata (pi. cliv. f. 28-31), Linn. Syst. Nat. 

 12th edit. p. 1130. V. ziczac, Limu Syst. 10th edit.? V. Dy- 

 sera, Chemn., tab. 28. f. 287-8-9-90. Mercenaria variabilis, 

 Schum. 



V. testa cordato-subtrigona, crassa, plerumque grisea, fusco 

 angulatim variegata, intus postice violacea, costellis duplicatis 

 radiata, varicibus concentricis crassiusculis reflexis crenulatis in- 

 ajquidistantibus cincta; latere postico declivi, subrostrato; area 

 dorsali planatim excavata, fusca vel literata; latere antico bre- 

 viusculo, rotundato ; lunula radiatim striata, fusca. 



Rather heart-shaped, triangular, thick, radiately double-ribbed, 

 girt with reflected, rather thick, crenulated varices at irregular in- 

 tervals. The hinder side is rather pointed ; the dorsal area much 

 excavated and flat; lunule striated, large, and generally dark. 

 There is generally a posterior patch of purple inside. This very 

 common shell is generally of a grey colour, variously marked with 

 angular lines and patches of brown. 



St. John's, Harkveg. Honduras Bay, Byson. 



20. Venus compta (pi. cliv. f. 32, 33, 34), Broderip, Pro. 

 Zool. Soc. 1838, p. 43. 



"V. testa subtrigona, planiuscula, crassa, lamelKs concentricis 

 lateraliter crenulatis crassiusculis radiatim creberrime costellata, 

 albente, lineis flavo-castaneis inscripta; area postica incisa, spa- 

 diceo-strigata ; lunula palKdiore; intus alba, limbo crenato.'' 



Resembhng V. cancellata, and with difficulty separated from it. 

 It is however a flatter shell, more spread at the sides, where 

 the radiating strise are divergent; and the concentric ribs less 

 reflected and more laminar. 



In coarse sand and mud, seven fathoms. Bay of Sechura, 

 Peru. 



21. Venus subrostrata (pi. cliv. f. 39), LamarcTc, Anim. 

 sans vert. no. 13. V. neglecta, Sowerhy, Zool. Beechey's Voy. 

 pi. 41. f. 8. 



V. testa cordato-subtrigona, postice subtruncata, crassa, pal- 

 lide fulvo-grisescente, fusco angulatim variegata, intus alba, cos- 

 telhs dupKcatis radiata, varicibus concentricis numerosis, crenu- 

 latis, laminatis, subtequidistantibus ; latere postico declivi, sub- 

 truncato; area dorsali planulatim excavata, f usco-literata ; latere 

 antico brevi ; lunula magna, striata, fusca. 



