NOTICE. 



THE following list is based on that published by P. P. CARPENTER, in his Report to 

 the British Association for the Advancement of Science, 1863, with the addition of 

 about 130 species which have been described since then, or were omitted. The land 

 and fresh water species, at that time only partially determined and not embodied in the 

 general list, are also added. The changes in range of distribution here made are 

 founded on more recent and correct information than was at his command, including 

 unpublished collections of Dr. Canfield, of Monterey ; Dr. Newcomb, of Oakland ; Rev. 

 J. Rowell, Mr. J. Hepburn and R. E. C. Stearns, of San Francisco ; Mr. Gabb, Prof. 

 Brewer and Mr. Bolander, of the Geological Survey ; Mr. W. II. Dall, of the W. U. 

 Telegraph Expedition, and others, whose special discoveries and labors have been all 

 acknowledged and tabulated in the Report on Mollusca to be published as one of the 

 series of the Geological Survey. 



There are twenty or thirty species still undetermined, and now in Mr. Carpenter's 

 hands, which will appear in the final report. 



It need scarcely be added that this list is not intended for a final authority on the 

 subject of names, which will probably be considerably changed by the time the volume ' 

 on Mollusca is printed. 



Most of these living species are found fossil also in the tertiary formations along this 

 coast, and have a wider range of distribution, many extending inland to the Sierra 

 Nevada, but the localities could not be included here. Specimens are found nearly as 

 perfect as the living shells. 



The list is intended for use both as a reference or check-list, and for labels. 

 Copies may be obtained at the office of the State Geological Survey, No. 90 Mont- 

 gomery Block, San Francisco. 



N. B. POLYZOA and TUNTCATA are not included. 



SAN FRANCISCO, April, 1867. 



