216 



- 34. Trigona crassatelloides, Conr. 



Cytherea {TriyoneUa) crassatelloides, Conr. Jouni. p. 253. pi. 19. 

 f. 17 ; Hinds, Voy. Sulph. Moli. p. 65. pi. 21. f. 1. 



Trigonia crassatelloides, Desli. B. M. Cat. Ven. p. 46. no. 1 ; B. M. 

 Mazatlan Cat. p. 58. no. 86. 



Hab. Sta. Barbara, San Diego, &c. Mus. Gould, Nuttall, Cuming, 

 Brit. &c. 



This shell attains the length of 7 inches, and is found about a foot 

 deep iu the sand. 



35. DosrNiA CALLOSA, Conr. 



Cytherea callosa, Conr. Journ. p. 252 (non Chione callosa, quasi 

 Com-., Desh. B. M. Cat. Ven. p. 135. no. 48). 



" D. t. subovata, subdepressa, alba ; costis concentricis, confertis, 

 planatis, huc et illuc antice et jtostice bifurcantibus ; intus 

 irregulariter callosa, margine tenuiore ; sinu pallii valde im- 

 presso, profundo^ 

 Long. 2 poli. 



Hab. Sta. Barbara. Mus. Nuttall. 



Mr. Nuttall found numerous valves of this species ; but, although 

 so thick, they were alvvays broken by guUs. It is said by Conrad to 

 resemble the fossil C. erycinoides. 



36. Venus Nuttalli, Conr. Journ. p. 250. pi. 19. f. 15 (non 14); 

 Hanl. Rec. Shells, p. 113 ; Wood, Suppl. pi. 16. f. 46. 



Chione Nuttallii, Desh. B. M. Cat. Ven. p. 135. no. 47. 



+ Chione callosa, Desh. loc. cit. no. 48 (pars quidem Californi- 

 ensis) : — non Veniis callosa, Conr. 



Hab. Sta. Barbara et San Diego. Long. 2 poli. Mus. Brit., 

 Nuttall, Cuming, &c. 



37. VENtrs CaliIforniensis, Brod. Proc. Zool. Soc. 1838, p. 43; 

 et auct. 



= Venus Californiana (qua8i Sow.), Conr. Journ. p. 251.pl. 19. 

 f. 16 (non 15). 



Chione Californiensis, Desh. B. M. Cat. Ven. p. 133. no, 44. 



Hab. San Diego, inter paludes limosas. Mus. Brit., Cuming, 

 Nuttall, &c. 



= Venus leucodon, Sow. teste Desh. loc. cit. 



38. Venus simillima, Sow. Thes. Conch. p. 708. pi. 153. 

 f. 17, 18. 



CJdone simillima, Desh. B. M. Cat. Ven. p. 133. no. 43. 

 Mus. Nutt. California. 



39. Venus (Chione) excavata, n. s. 



V. t. cordata, subtumida, solida, alba, ud umbones antice incur- 

 vatas, appropi7iquantes, fusca ; costis radiantibus, rotundatis, 

 interstitiis (Bąuantibus, postice parvis, acutioribus, antice con- 

 fertis, rotvndatis ; lamellis concentricis nitentibus, crebriori- 



