ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 571 



lives there. The shell here figured is beaked like Nuttalli, no. 49 ; lii- 

 nule very faint ; concentric ridges very faint, but sharp ; radiating ribs 

 very coarse. Inside deeply stained ; margin not cie:mted on the shai-p 

 anterior edge, though faintly on the lunule ; hinge-teeth stumpy.] 



CO. Venus muscaria, Rve. Hab. ? — [Has the aspect of a West Coast species, 

 between cardioides and fine var. of staminea ; sinus large ; teeth strong, 

 not bifid ; lunule with radiating ribs.] 



08. Vemis undaiella, Sby. Gulf Oalif [Not a satisfactory species, the type 

 having the aspect of a poor specimen altered for cabinet. The " sculpture 

 much changing in its development towards the margin " is an accident 

 often seen in the cancellated species. Similar specimens of V. neglecta, 

 no. 54, collected at Cape St. Lucas by Mr. Xantus, agree with undeitella 

 in all respects, except that this is violet within, neglecta being white. 

 Ligament-area (a-s in neglecta) smooth in one valve only.] 



77. Venus Adamsii, Rve. Japan. [Closely related to Tapes laciniata, San Diego, 

 in size, aspect, hinge, &c. Diflfers in mantle-bend being not so long or 

 pointed, and the radiating sculpture much finer : = F. rigida, Gld., MS., in 

 Stimpson's list; non Gld. in 'Otia.'] 



80. Verms ornatissima,^TodL. Panama, sandy mud, 10 fms., Ci/mt«9. Still unique. 

 [Like V. gnidia, lun.,\>\it radiating ribs coarser and more distant ; con- 

 centric frills not palmated ; lunule pale, laminated.] 



87. Venu^ callosa [Sby., non] Conr. Sandwich Is. and Calif. [Ftrfenote to no. 

 59. This IS the V. NiittaUii of the Brit. Assoc. Report. Those who regard 

 it as distinct from fluctifraga, of which gibbosula, no. 47, is the extreme 

 form, may retain tne name callosa of Shy., but not of Conr. Conrad's 

 species =C nobilis, Rve.; differing from the true Callisfcs, a,s Mercenaria 

 does from Venus, in having the ligament-plate rugose.] = V.fludifragu, 

 Shy., teste Rve. in errata, 

 105. Vemis bilineata, Rve. Gulf Calif. Partakes of the characters of compfa 

 and subimbricata: all three may indeed be different states of one and the 

 same species. [The shell figured at 1055 has all the peculiar features of 

 compta, which are clearly marked within ; only the concentric waves are 

 closer than usual. The shell figured at 105o appears to be the true un- 

 datella, only in fine condition, the type being rubbed. It has exactly the 

 same internal characters, including colour ; only the colour-lines outside 

 are arranged in rays instead of V s. Mr. Reeve, however, retains his differ- 

 ent opinion.] 

 116. Fewjw Ci//)?-ia, Sby., P. Z. S. 1852. Is. Plata, "West Columbia. [From same 

 district, teste Schott in Mus. Smiths.] Has all the appearance of being 

 an attenuately produced form of the West Indian F. paphia [which is 

 also from Cape Verd Is., teste Macgillivray in Brit. Mus.]. 



11. Dione* macMlata, \J\sX. West Indies ; Brazil ; Pacific Ocean. Widely distri- 

 buted in both hemispheres. [No authority for the Old World ; the Pacific 

 shells are Callista chimuea, var.] 



15. Dione nobilis, Rve., 1849. Cal. [=C. callosa, Conr., 1837. The original 

 name, from type, had been communicated to Mr. R., but is not quoted.] 



20. Dione semilameUosa \, GfSXii., = C. lupanaria, Less. Centr. Am. [^lupinai-ia, 



Maz. Cat., no. 95. Vide Deless. Rec. Coq. pi. 19. £ 2 : " China Seas," no 

 authority.] 



21. Dione breviipittata,'Rve.,=bremspina, Shy. [Gulf of ] California. [Scarcely 



differs from C. rosea, jun.] 



22. Dione muUispinosa, Shj. Peru. Concentric ridges thinly laminated ; spinrs 



slender and numerous. [An extreme form of the Pacific C. Dione (teste 

 Hani.) ; distinct from semilamellosa.^ 

 2-3. Dione Veneris, D'Arg. Conch, pi. 21. f. 1,= F. Dione, Ln. West Ind. and 



, * The figured types of this genus had been accidentally mislaid ; and might alter the 

 judgments given in the text. 



t " For obvious reasons, I think it best to abandon the foul name given to this lovely 

 species by Lesson," Bve. ( Vide Maz. Cat. p. VO, note.) ? Wc uld not the same reasons 

 lead to the alteration of meretrix, impudica, &o. 



57 



