Wff 



REPORT 1853. 



•Tapes staminea. 



Ohama frondosa. 



Cardiiun procerum. 



Liooardium elatum, 



Modiola capax. 



Modiola Brasiliensis. 



Lithophagus attenuatus. 



Bartatia gi'adata. 



Pecten yentricosus. 



Ostrea Virginica (Maz. Cat.). 

 *Ostrea lurida, var. < 



Ostrea concliaphila. 



Ostrea amara. 



Siphonaria sequilirata (=leTiusoula, 

 Sby., teste Cuming). 



Siphonaria gigas. 

 •Helix areolata, Fbs. (The only land- 

 shell received from the Bay.) 



Dentalium teti'agonum, Sby. 



Dentalium semipolitum. 



Dentalium lacteum, Fhil. 



Acmaea strigatella. 



Aomsea atrata. 



Gadinia reticulata. 



Calliostoma versicolor. 

 *Chlorostoma gaJlina. 

 *Chlorostoma aureotinctum. 



Nerita scahricosta. 



Nerita Bernhardi. 



Crucibulum spinosum. 



Crucibidum imbricatum. 



Crepidula onyx. 



Orepidula excavata. 



Galerus conicus. 



Oerithium stercus musoarum. 



Pyrazus incisus and var. 



Rhinoclavis gemmata. 



Oerithidea Mazatlanica. 



Litorina fasciata. 



Litorina aspera, var. 



Conus " reticulatus " (^Pease). 



Conus " emarginatus " (Pease). 



Conus interruptus. 



Neverita Eecluziana. 



Polinices bifasoia,ta. 



Caucellaria urceolata. 



Cancellaria goniostoma. 



" Cyprsecassis testiculus " [perhaps 



Dead. 

 Dead 



Malea ringens. 

 Priene nodosa. 

 Oliva suhangulata. 

 Oliva porphyria. 

 Purpura patula. 

 Purpura hiserialis. 



*Purpura ostrina. [Normal, living.] 

 Vitularia salehrosa. 

 Monoceros luguhre, var. 

 Cerostoma monoceros. 

 Nassa tegula. 

 Siphonalia anomala. 

 Phyllonotus nigritub. 



In the above list, the only strictly Californian species are those marked 

 . with a *. 



The following species have been received frona La Paz, besides those tabu- 

 lated in Major Eich's list, p. 641, in the C. S. L. Ust, p. 619, and the B. A. 

 Eep. p. 352. It is clear that the fauna of the district is essentially tropical, 

 and remarkably free from Californian species. 



Dentalimn semipolitum. 



Turritella punctata. 



Modulus cerodes. 



OliveUa fvlgida, Lieut. Trowbridge [teste W. Cooper ; but probably added by 



him accidentally from his W. African collections. It has not been received 



from any other West-coast source]. 

 Siphonalia modiftcata. 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.,= ilfaeira modesta, Sloat MS. 



Dosinia ponderosa. Very large. 



Chime fluctifraga, Sby.,= V. Cortezi, Sloat MS. \_—gibhosula (Desh.), Rve.,= 



callosa, Sby., non Conr.l. 

 Chimie sucdncta, ya.\.,= Califomiensis, Brod., = F. o-ossa, 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 amathtisia. 



152 



