[From the Proceedings of the California Academy of S ■-■jnces, July 21st, 1873.] 



Shells collected at San Juanico, Lower California, by- 

 William M. Gabb. 



BY ROBERT E. C. STEARNS. 



The species contained in this and the succeeding list, were collected in the 

 month of February, 1867, by Prof. Gabb, who kindly submitted the same to 

 me for examination. As the knowledge of Lower California Mollusca is 

 exceedingly limited, the publication of these lists may be of some beueflt to 

 students, and of value as data bearing upon geographical distribution. San 

 Juanico is on the east side of the peninsula of Lower California, in latitude 

 about 27° north. 



Solecurtus Californianus, Conr. 



Periploma argentaria, Conr. 



Standella planulata, Conr. 



AmphichiEna Kinderraanni, Phil. 



PeronEEoderma viriditincta, Cpr. 



Donax flexuosus, Gld. 



Semele bicolor, C. B. Ad. 



Fulvia aspersum, Sby.* 



Cyclas dentata, Wood. 



Mysia orbella, Gld. 



Crasaatella gibbosa, Sby. 



Lazaria radiata, Brod. 



Area Pacifica, Sby. 



Anomalocardia grandis, Brod. if Sby. 



" raulticostata, Sby. 



" tuberculosa, Sby. 



Vola dentata, Sby. 



Chione fluctifraga, Sby. 

 Chione succincta, Val. 

 Chione similliraa, Sby. 

 Callista chiona^a, Mke. 

 Tivela radiata, Sby. 

 Dosinia ponderosa. Gray. 

 Cardium senticosum, Sby. 

 Omphalius fuscescens, Phil. 

 Crucibulum imbricatuni, Sby. 

 Haustator goniostoraa, Vol. 



" tigrina, Kien. 



Cerithidea albonodosum, Cpr. 

 Trivia radians, Lam. 

 Strombus granulatus, Swains. 

 Neverita Recluziana, Rve. 

 Malea ringens, Sby. 



*In Adams's Gen. Moll, this species is catalogued as "aspera, -S6?/.;" but in Sowerby's 

 Oonch. Illustr. (Fig. 15) it is " C. aspersum, Sow., Zool. Proc. Ic33, p. 85," and is credited to 

 " St. Elena, Mr. Cuming." It is strikingly like its Caribbean analogue F. 6u?iatom. St. Elena 

 is on the coast of Guayaquil, in latitude about 2 deg. south. If Mr. Cuming's " habitat " is 

 correct, it shows a wide range, and the two species mentioned herein may have descended 

 from the same ancestors. 



