ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. G71 



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

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

 very coarse. Inside deeply stained ; margin not cve:iated on the sharp 

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



60. Venus miiscaria, Rve. Ilab. ?— [Has the aspect of a West Coast species, 

 between cardioidvs and tine var. of staminea ; sinus large ; teeth strong, 

 not bifid ; lunule with radiating ribs.] 



68. Ve>ius undatella, Sby. Gulf Calif. [Not a satisfactory species, the tj'pe 

 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. neyheta, 

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

 in all respects, except that this is violet within, nct/lccta being white. 

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



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

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

 pointed, and the radiating sculpture much finer := V. rigida, Gld., MS., iu 

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



80. Venus ornatissima, Brod. Panama, sandy mud, 10 fms., Cuming. Still miique. 

 [Like V. gnidia,]\m.,'hvit radiating ribs coarser and more distant; con- 

 centric frills not palmated ; lunule pale, laminated.] 



87. Venus callosa [Sby., non] Conr. Sandwich Is. and Calif. \Vide note to no, 

 59. This IS the V. NuttaUii of the Brit. Assoc. Report. Ihose who regard 

 it as distinct from Jluctifraga, of which gihbosula, no. 47, is the extreme 

 form, may retain the name callosa of Sby., but not of Conr. Conrad's 

 species = C. nohilis, Rve. ; diftering from the true CaUist(t, as Mercenaria 

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

 Sby., teste Rve. in errata. 

 105. Venus bilineata, Rve. Gulf Calif. Partakes of the characters of compta 

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

 same species. [The shell figured at 1056 has all the peculiar features of 

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

 closer than usual. The shell figured at lOSrt appears to be the true t<n- 

 dafella, 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. Veitus Ci/pria, 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 J\ paphia [which is 

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



11. Dione * maculuta, List. West Indies ; Brazil ; Pacific Ocean. Widely distri- 

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

 shells are Callista chioncea, 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 setnilatnellosa ■f, 0{{ud., = C. htpanaria. Less. Centr. Am. [ = lnpi/uiria, 



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

 authority.] 



21. Dione brevispinnta, Hve., = brevispina, Shy. [Gulf of ] California. [Scarcely 



difters from C. rosea, jun.] 



22. Dione midtispinosa, Sby. Peru. Concentric ridges thinly laminated ; spines 



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

 Ilanl.) ; distinct from semilamellosa.'\ 



23. 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 

 epeoies by Lesson," Rve. {Fide Maz. Cat. p. 70, note.) ? Wc uld not Ilia same reasjons 

 lead tu the altci'atiou of" meretrix, imjpudica, &a. 



57 



