314 Gould's Descriptions of Shells 
Art. XXIV. — Descriptions of Shells from the Gulf of Cali- 
fornia and the Pacific Coasts of Mexico and California. 
By Avausrus A. Gour», M. D. 
Durine 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 José, 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 tbe 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 9 
