REPORT 1363. 



*Tapes staminea. 



Chama frondosa. 



Cardiimi procerum. 



Liocardium elatum. 



Modiola capax. 



Modiola Brasiliensis. 



Lithophagus attenuatus. 



Barbatia gradata. 



Pecten ventricosus. 



Ostrea Virginica (Maz. Cat.). 

 *Ostrea lurida, var. 



Ostrea conchaphila. 



Ostrea amara. 



JSiphonaria eequilirata (=leviuscula, 

 Shy., teste Cuminy). 



Siphonaria gigas. 



Helix areolata, Fbs. (The only land- 

 shell received from the Bay.) 



Dentalium tetragonum, Sby. 



Dentalium seniipolitum. 



Dentalium lacteum, Phil. 



Acmsea strigatella. 



Acmaea atrata. 



Gadinia reticulata. 



Calliostoma versicolor. 

 *Chlorostoma gallina. 

 "Chlorostoma aureotinctum. 



Nerita scabricosta. 



Nerita Bernhardi. 



Crucibulum spinosum. 



Crucibulum imbricatuin. 



In the above list, the only strictly 

 with a *. 



Crepidula onyx. 



Crepidula excavata. 



Galems conicus. 



Cerithiuni stercus muscaruni, 



Pyrazus incisus and var. 



Rhiuoclavis gemmata. 



Cerithidea Mazatlanica. 



Litorina fasciata. 



Litorina aspera, var. 



Conus " reticulatus " (Pease). Dead. 



Conus " emarginatus " (Pease). Dead 



Conus interruptus. 



Neverita Reciuziana. 



Polinices bifasciata. 



Cancellaria urceolata. 



Cancellaria goniostoma. 



" Cyprcecassis testiculus " [perhaps 



tenuis], 



Malea ringens. 

 Priene nodosa. 

 Oliva subangulata. 

 Oliva porphyria. 

 Pui*pura patula. 

 Purpura biserialis. 



*Purpura ostrina. [Normal, living.] 

 Vitularia salebrosa. 

 Monoceros lugubre, var. 

 Cerostoma monoceros. 

 Nassa tegula. 

 Siphonalia anomala. 

 Phyllonotus nigritiib. 



Californian species are those marked 



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. 



Turritella punctata. 



Modulus cerodes. 



Olivella ful-gida, Lieut. Trowbridge [teste W. Cooper j but probably added by 



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



from any other West-coast source]. 

 Siphonalia modificata. Dead. 



A very interesting series of shells were collected at Guaymas and Pmacati 

 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 Jluctifraya, Sby.,= V. Coj-tezi, Sloat MS. [=gibbosula (Desh.), Rve v = 



cattosa, Sby., non Conr.l 

 Chione succincta,V&l.,= valiforniensis, 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. 



152 



