19. 
22. 
33. 
41, 
ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 369 
- Orbicula ostreoides, Lam.,= O. Norvegica, Sby. (non Lam.) + O. striata, Sby. + 
Cranva radiosa, Gld.+ O. { Diseina] Evansii, Dav. ? N.W. Africa. “The 
locality, ‘ Bodegas, Cal.,’ given by Mr. D. with O. Evansii, on Mr. Cuming’s 
authority, must, I think, be a mistake.” [The genus has not been found 
on the Californian coast by any American collector. 
Venus* grata, Sby.,+tricolor, Shy. Gulf of Mexico, Mus. Cum. [= Tapes 
grata, Say, Panama. The locality-labels have probably been misplaced. 
These specimens are undoubtedly from the West Coast, nor has any 
authority appeared for the species in the Atlantic. The Gulf of Mexican 
“analogue ” is Z\ granulata. The forms are intermediate between Chione 
and Tapes. | 
. Venus multicostata, Sby. Bay of Panama, in coarse sand at low water, Cuming. 
“Probably = V. Listeri,var.,with ribs more tumidly thickened and rounded.” 
[The West Coast shells are distinguished by the very slight crenulation 
of the ribs at the sides. | 
Venus asperrima, Shy. Guacomayo, Centr. Am., sandy mud, 13 fms., Cuming. 
“A form of pectorina; shell of lighter substance, broader and more de- 
pressed ; sculpture more elevately and definitely latticed.” [This is the 
shell named by Mr. Cuming V. cardiotdes, Lam., and should take that 
name, as prior to Sby.’s, if really distinct from pectorina. Also from 
Panama. Mus. Smiths. ] 
Venus discors, Shy., jun. St. Elena and Guacomayo, Centr. Am., sandy mud, 
6-9 fms., Cuming. _“ Concentric decussating ridges cease abruptly at the 
posterior third.” [Character very variable, even in the type-specimens ; 
=T. grata, Say, var.] 
. Venus pectorina, Lam., p. 344,+ V. cardioides, Lam. Centr. Am., Mus. Cum. 
[Probably Atlantic ; much heavier and stumpy; sculpture coarser; teeth 
more like casina, whereas cardioides, no. 19, has a long anterior tooth 
like sugillata t. 
Venus cingulata, Lam.,=pulicaria, Brod. W. Columbia, Cuming. [=V. 
Pinacatensis, Sloat, MS. in Mus. Smiths. Guaymas. The peculiar 
smoothing-off of the central sculpture in the adult may be varietal. It 
is improbable that Lam. was acquainted with the species. | 
Venus crenulata, Chem.,=crenata, Gmel. W.I. = V. eximia, Phil.,+ V. cre- 
nifera, Sby.,+ V. Portesiana, D’Orb. [Not to be confounded with the 
V. crenifera, Maz. Cat.: has a small Cyprinoid lateral tooth, but no 
radiating ribs near lunule, nor long anterior tootht. | 
Venus Californiensis, Brod.,= V. leucodon, Sby. Guaymas, Gulf Cal., sandy 
mud, low water, [teste] Cuming. Mus. Cum. [= V. crassa, Sloat, MS. in 
Mus. Smiths. Not V. Californiana, Conr.,=V. simillima, Sby. This 
species, with V. neglecta, compta, &c., having the mantle-bend nearly 
obsolete, approach Anomalocardia subimbricata, and with that species 
form a natural group, differing from the typical Venus as Lioconcha does 
from Callista := V. succincta, Val. 
Venus Kennerleyi, Cpr., MS.t in Mus. Cum, Hab.—? [Puget Sound, 
Kennerley. | 
Venus sugillata, Rve. California, Mus. Cum. Characterized by the shining 
purple umbos, finely latticed sculpture, dark-stained lunule and liga- 
mentary area. [= “ V. crenifera, Sby., teste Rve.,” Maz. Cat. no. 105, 
in all essential characters. Differs in the long anterior tooth being still 
* Through the kindness of Mr. Reeve, with a view to the completion of this Report, 
I was enabled to compare the figured specimens in this genus with the text, and with 
the shells of the Smithsonian collection, before they were distributed. The bracketed notes 
in the text are based on this examination. They are given with unusual detail, because 
of the unique opportunity of throwing some light on a confessedly difficult family. 
+ The characters of the teeth and pallial line frequently afford satisfactory diagnostic 
marks between critical species, which are often overlooked by monographers. 
-} The descriptions of Dr. Kennerley’s shells had long been written, and would have 
been published but for the American war. The localities of all the West Coast shells sent 
from the Smiths. Col. to Mr. Cuming were duly marked in the accompanying catalogues. 
