715 



angularly spotted with white, while that of the left is of the same 

 dark colour as the lunule and a portion of the hinder part of the 

 shell. 



Puerto Puero, Central America. Cuming. 



34. Venus crenifera (pi. clvi. f. 73, 74), Sowerby, Pro. 

 Zool. Soc. 1835, p. 43. V. elevata? Say. V. radiata, Chemn. 

 t. 36. f. 386 ? 



"V. testa elliptica, asperft, albicante-fusco maculata et varie 

 picta ; lamellis concentricis brevibus, confertis, striis radiantibus 

 confertissimis decussatis ; margine ventrali crenulato ; dente car- 

 dinali antico magno." 



Except in rare cases the fringed concentric ridges of this rather 

 beaked shell are raised very slightly over the radiating striae, 

 which are arranged in groups of three; several of the groups 

 more distinct and distant at the anterior side. The lunule is dis- 

 tinct, striated, and generally dark in colour ; the dorsal area ex- 

 cavated, smooth, and strongly marked with brown. The surface 

 is generally marked by radiating broad bands of zigzag markings. 



The specimens were found in sand at low water at Payti, Peru. 

 Cuming. 



35. Venus decorata (pi. clvi. f. 77, 78), Broderip et 

 Sowerby, Zool. Journ. vol. v. p. 49. V. bella, Jonas, Philippi, 

 Abbild. t. 4. f. 4. 



" V. testa cordato-trigona, latere postico productiore, alba, liris 

 longitudinalibus crenulatis sulcisque radiantibus decussatis granu- 

 losa ; margine crenulato." 



This elegantly sculptured shell is characterized by radiating 

 ribs, the three posterior of winch are larger than the others ; they 

 are crossed by concentric fringed varices, which are scalloped as 

 they pass over them. In the darkly-coloured variety the lunule 

 and dorsal margin are of a very dark colour. The form is rather 

 cordate, acuminated at the back. 



West Indies. 



36. Venus imbricata (pi. clvi. f. 81, 82), Sowerby, jun. 



V. testa ovali-subcordata, parva, albida, costis validis acute la- 

 minatim imbricatis radiata ; latere postico angulato, fusco, declivi, 

 acuminato, latere antico brevi ; lunula parva, fusca, striata ; um- 

 bonibus (intus quoque) purpurascentibus. Variat costellis fuscis 

 interstitiis albis. 



