ACADEMY OE NATURAL SCIENCES. 



275 



Mr. Stearns presented the following paper : 

 List of Shells collected at Baulines Bay, California, June, 1866. 



BY ROBT. E. C. STEARNS, CURATOR OF CONCHOLOGY, CAS* ACAD. NAT. SCIENCES. 



The comparative scantiness of molluscan life in the immediate vicinity of 

 San Francisco, and of the coast for many miles in a southerly direction, led me 

 to believe that an exploration of the small bays to the north of the Golden 

 Gate would reveal a very considerable increase both of species and individuals ; 

 accordingly, upon the 14th, 23d, and 24th of last June, I visited the small inlet 

 known as Baulines Bay, and made an examination of the sandspit which make3 

 out from its southerly shore, also the beach inside of and as far north as Dux- 

 bury reef, which latter connects with the coast at a point about a mile above 

 the entrance to the bay. The unfavorable condition of the tides prevented an 

 exploration of the reef ; as most of the specimens were obtained from the drift, 

 without doubt the following list can be largely increased by a more thorough 

 examination of the locality, especially the reef, at extreme low water and at 

 different seasons of the year. 



All of the specimens were in a condition sufficiently perfect to make identi- 

 fication easy ; a few forms, of which I had some doubt, were submitted to Dr. 

 J. G. Cooper. 



. Cardium corbis, Mart. 

 . Lazaria sub-quadrata, Carp. 

 . Mytilus Califoruianus, Conr. 

 , Mytilus edulis, Linn. 

 . Adula stylina, Carp.f 



Pecten hastatus, Sby.* 



Hiunites giganteus, Gray. 



Placunanomia macroschisma, — 

 Desh.f 



Cryptochiton Stelleri, Midd. 



Tonicia lineata, Wood.* 



Mopalia muscosa, Gould. 



Mopalia vespertina, Gould.* 



Trachydermon Nuttallii, Carp. 



Nacella insessa, Hds. 



Nacella instabilis, Gould.* 



Nacella ? var. triangularis, Carp.f 



Acrnsea persona, Esch. 



Acmaea spectrum, Eve. 



Acinaea pelta, Esch. 



Acmaea var. asmi, Midd. 



Acmaea patina, Esch. 



Acmaea scabra, Eve. (var.) 



