ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 571 



lives there. The shell here fiorured is beaked like NuttuUi, no. 49 ; In- 

 nule very faint : conceutrie ridf^es very laint, but sharp; radiating' ribs 

 very coai-se. Inside deeply stained ; margin not creriated on the sharp 

 anterior edge, thougli faintly on the luniile ; hinge-teeth stumpy.] 



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

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

 not bitid ; lunule with radiating ribs.] 



68. Vemis utuluteUa, Sby. Gulf Calif. [Not a satisfactory species, the type 

 having the a-»pect 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 "pecimens of V. neylneta, 

 no. 54, collected at Cape St. Lucas by Mr. Xantus, agree ■v\-ith undati-l/a 

 in all respects, except that this is violet \vithin, tuj/Ucta being white. 

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



77. Venus Adamsii, live. Japan. [Closely related to Tapes laci'niata, San Diego, 

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

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

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



80. V&ms ornatkswm, livoA. Panama, sandy mud, 10 fms., 0/»iwy. Still unique. 

 [Like F. .9««/t«, jun., but radiating ribs coarser and more distant; con- 

 centric frills not palmated ; lunule pale, laminated.] 



87. Venus cullosa [Sby., non] Conr. Sandwich Is. and Calif. [ f'*<^e note to no. 

 51). This IS the V. XuttaUii of the Brit. Assoc. Report. Those who regard 

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

 form, may retain the name callosa of Sby., but nut of Conr. Conrad's 

 species =t'. nohi/h, live.; diflering from the true Callista, w^ Mercrnaria 

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

 Sby., teste Rve. in errata. 

 105. Venus biliiwata, live. Gulf Calif Partakes of the characters of c&tnpta 

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

 same species. [The shell figured at 1056 has all the peculiar featiu-es of 

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

 closer than usual. The shell Kgured at 105rt appeal's 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 dill'er- 

 ent opinion.] 

 IIG. Venus Ci/pria, Sby., P. Z. S. 1852. Is. Plata, West Columbia. [From same 

 district, teste Schott in JIus. Smiths.] Has all the appearance of bfiug 

 an attenuately produced fonn of the West Indian V. paphia [which is 

 also from Cape \'erd Is., teste Macgillivray in Brit. Mas.]. 



11. Dione* macuhif a, List. West Indies ; Brazil ; Pacific Ocean. Wii'ly distri- 

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

 shells are Cullixfa chioneea, var.] 



15. Dione nobilis, Rve 1H4U. Cal. \_=C. callosa, Conr., 18-37. The original 

 name, from type, had been communicated to Mr. 11., but is not quotid.] 



20. Dione semilamellosa ■f,(im\d., = C. lu/mnaria, Less. Centr. Am. [=/upiiiiiria, 



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

 authority.] 



21. Dione breviymnfa, Hve., = brevispiua, Shy. [Gulf of ] California. [Scarcely 



differs from C. ivwtrt, jun.] 



22. Dione inuUispinosa, Sby. I'eru. Concentric ridges thinly laminated ; spines 



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

 Hani.) ; distinct from semilamellosa.^ 

 21. Dione Veneris, D'Arg. Concii. pi. 21. f. 1,= V. Dione, Ln. West Ind. and 



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

 jiuli;ment8 given in tlie text. 



t " Foe obvious reasons, I tliink it b^st to abandon the foul name given to this lovely 

 epoeies hy Lesson," Rve. ( fide Maz. Ciit. p. 70, note.) ? W'c uld not the same reaeona 

 lead to tile alteration of meretrix, im^udira, &c'. 



57 



