150 PROCEEDINGS OP THE CALIFORNIA 



by these eddies, making the long spit which usually forms the beach 

 south of the entrance of the bays, as at San Diego, San Pedro, 

 Humboldt and Shoalwater Bays. Usually, too, the area of the 

 bays is largest south of their mouths. 



Dr. Kellogg exhibited specimens of a plant ( Ceanothus infestans) 

 brought by Prof. Davidson from the Chilchat river, latitude 59° 25', 

 but previously considered Mexican. 



Dr. Cooper remarked that the shells sent by Dr. Reid would fill 

 several gaps in the Academy's collection of shells of the West 

 Slope of North America, and in the following article : 



On Shells of the West Slope of North America. 



BY J. G. COOPER, M.D.* 



The shells presented this evening were collected by Dr. Robert K. Reid, 

 formerly of Stockton, and since a surgeon in the California Volunteers, who 

 collected them while stationed near Salt Lake in 18(34. By unknown causes 

 their arrival has been delayed until now. As the molluscan fauna of the great 

 interior Basin is still imperfectly known, I have included in a catalogue of his 

 species those collected more recently, in that and adjoining regions, by Mr. H. 

 Hemphill, C. D. Voy, W. G. W. Harford, G. W. Dunn, L. G. Yates, J. Rowell, 

 myself and others, with short descriptions of the species not given in the 

 synopsis referred to. 



There are among these several additions to the lists of Helicoids given by me 

 in our Proceedings, Vol. III., p 330, and the synopsis of Limmida in Vol. 

 IV., p. 92, as well as the Geographical Catalogue compiled for the Geological 

 Survey in 1867. 



I add a few of the most important notes on species obtained outside of the 

 Basin since previous publications. 



Additions to the fauna have their names in small capitals. 



1 Sphajrium patella Gld. Lakeport, Upper Clear Lake— C. D. Voy. 



2 S. lenticula Gld. Found by me near San Joaquin River and 

 Visalia. 



3 S. striatinum iamL Humboldt River— J. Hepburn. I found 

 thirteen specimens at the north end of Clear Lake, apparently a variety of this 

 species or S. d e n t a t u m Hahl. 



4 Pisidium abditum Hald. Raft River, near Fort Hall, Idaho 

 —Dr. Reid. 



5 P. ultramontanum Prime ? " Narrows " of Clear Lake. Rare ; 

 approach form of P. compressum. 



6 Margaritana falcata Gld. Near Salt Lake or Fort Hall— Dr. 

 Reid. Stanislaus River is the most southern point I have found it inland. 



* For full notes on the species, I may refer to the American Journal of Conchology 

 Vols. IV., v., VI., and to the State Eeports now being prepared. 



