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Descriptions of Shells from the Gulf of California and the 

 Pacific Coasts of Mexico and California. By AUGUSTUS 

 A. GOULD, M. D. 



DURING the recent war with Mexico, several valuable col- 

 lections of shells were made by officers of the navy and army 

 engaged on the Pacific coast of Mexico and California, and 

 along the Gulf of California. Three of these have been sub- 

 mitted to me for examination. They were made by Col. E. 

 Jewett and Maj. William Rich, of the army, and Lieut. 

 Thomas P. Green, of the navy. The coast visited extended 

 from Panama, 8 49' N. to San Francisco, about 37 20' N. ; 

 and the other principal localities explored were, on the Mexi- 

 can coast, Acapulco, Mazatlan, San Jose, and Guaymas, 

 (28 N.) ; La Paz, about 24 30' N. and San Juan, 27 N. 

 on the west coast of the Gulf; and San Pedro, San Diego, 

 Santa Barbara, and Monterey, on the California coast. The 

 number of species from Col. Jewett was about 225 ; from 

 Maj. Rich, 130 ; from Lieut. Green, 200 ; in all, perhaps, 

 400 species ; and as they were collected alive by the gentle- 

 men themselves, and their localities carefully noted at the 

 time, they become very valuable when considered in the light 

 of geographical distribution. It would be interesting to pub- 

 lish the whole list ; and perhaps this may be done at some 

 future period. It has already been done so far as respects 

 those species which were found at Panama, and at other 

 places in common with Panama, by the late Prof. C. B. 

 Adams, in his very interesting work on the shells of Panama. 

 Several very curious facts derived from a comparison of these 

 Pacific species with the shells of the Gulf of Mexico might 

 here be stated ; but it is our present purpose to give descrip- 

 tions and figures of the new species, so far as the prescribed 

 limits of the paper will admit. Brief characters of some of 

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