710 



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

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

 sera, C/iemn., tab. 28. f. 287-8-9-90. Mercenaria variabilis, 

 Sc/tum. 



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

 angulatim variegata, intus postice violacea, costellis duplicatis 

 radiata, varicibus concentricis crassiusculis reflexis crcnulatis in- 

 eequidistantibus 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, Hartweg. Honduras Bay, Dyson. 



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

 Zool. Soc. 1838, p. 43. 



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

 lateraliter crenulatis crassiusculis radiatim creberrime costellata, 

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

 diceo-strigata ; lunula pallidiore ; intus alba, limbo crcnato." 



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

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

 the radiating striae are divergent; and the concentric ribs less 

 reflected and more laminar. 



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

 Peru. 



21. Venus subrosteata (pi. cliv. f. 39), Lamarck, Anim. 

 sans vert. no. 13. V. neglecta, Sowerby, 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- 

 tellis duplicatis radiata, varicibus concentricis numerosis, crenu- 

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

 truncato ; area dorsali planulatim excavata, fusco-literata ; latere 

 antico brevi ; lunula magna, striata, fusca. 



