666 
*Tapes staminea. 
Chama frondosa. 
Cardium procerum. 
Liocardium, elatum, 
Modiola capax. 
Modiola Brasiliensis. 
Lithophagus attenuatus. 
Barbatia gradata. 
Pecten ventricosus. 
Ostrea Virginica (Maz. Cat.). 
*Ostrea lurida, var. 
Ostrea conchaphila. 
Ostrea amara. 
Siphonaria zequilirata (=leviuscula, 
Sby., teste Cuming). 
Siphonaria gigas. 
*Helix areolata, F'bs. (The only land- 
shell received from the Bay.). 
Dentalium tetragonum, Sby. 
Dentalium semipolitum. 
Dentalium lacteum, Phil. 
Acmea strigatella, 
Acmea atrata, 
Gadinia reticulata. 
Calliostoma versicolor. 
*Chlorostoma gallina. 
*Chlorostoma aureotinctum. 
Nerita scabricosta. 
Nerita Bernhardi. 
Crucibulum spinosum. 
Crucibulum imbricatum. 
REPORT—1863. 
Crepidula onyx. 
Crepidula excavata. 
Galerus conicus. 
Cerithium stercus muscarum, 
Pyrazus incisus and var. 
Rhinoclavis gemmata. 
Cerithidea Mazatlanica. 
Litorina. fasciata. 
Litorina aspera, var. 
Conus “ reticulatus ’’ (Pease). Dead. 
Conus “ emarginatus” (Pease). Dead. 
Conus interruptus. 
Neverita Recluziana. 
Polinices bifasciata. 
Cancellaria urceolata. 
Cancellaria goniostoma. 
“ Cypreecassis testiculus ” 
tenuis |. 
Malea ringens. 
Priene nodosa. 
Oliva subangulata. 
Oliva porphyria.. 
Purpura patula. 
Purpura biserialis. 
*Purpura ostrina. [Normal, living. ] 
Vitularia salebrosa. 
Monoceros lugubre, var. 
Cerostoma monoceros. 
Nassa tegula. 
Siphonalia anomala. 
Phyllonotus nigritus. 
[perhaps 
In the above list, the only strictly Californian species are those marked 
with a *. 
The following species have been received from La Paz, besides those tabu- 
lated in Major Rich’s list, p. 541, in the C.S. L. list, p. 619, and the B. A. 
Rep. p. 352. 
It is clear that the fauna of the district is essentially tropical, 
and remarkably free from Californian species. 
Dentalium semipolitum. 
Turrttella punctata. 
Modulus cerodes, 
Olivella fulgida, Lieut. Trowbridge [teste W. Cooper; but probably added by 
him accidentally from his W. African collections, 
from any other West-coast source ]. 
Siphonalia modificata. Dead. 
A very interesting series of shells were collected at Guaymas and Pinacati 
Bay, by Capt. Stone and Mr. Sloat. The latter gentleman affixed MS. names 
to those which he regarded as new. They were in remarkably beautiful 
condition, the bivalves having an unusually porcellanous aspect, and many 
of the species presenting local peculiarities. 
Mulinia carinulata, Desh.,= Mactra modesta, Sloat MS. 
Dosinia ponderosa, Very large. | 
Chione fluctifraga, Sby.,= V. Cortez’, Sloat MS. [ =gibbosula (Desh.), Rve.,= 
callosa, Shy., non Conr. |. 
Chione succincta, Val.,= Californiensis, Brod.,= V. crassa, Sloat MS, [Very 
variable in sculpture ; also, with the last, varies greatly in shape, some of the 
specimens being much produced, others rounded. ] . 
Chione gnidia, Brod. , Passing into amathusia. 
It has not been received 
