A. E. Verrill on Shells from the Gulf of California. 217 
men resembles in nearly all important particulars. The most 
marked difference between them is the presence in the latter of 
ns, 1s 
f 
fossil bird bone yet found west of t ; 
age, 
e Roc ountai 
from a fresh-water Tertiary deposit, probably of Pliocene 
the present article, the writer desires, in conclusion, to express 
his grateful thanks to Professor Joseph Leidy, of Philadelphia, 
Yale College, New Haven, Conn., Feb. Ist, 1870. 
ArT. XXVI.— Contributions to Zoiilogy from the Museum of Yale 
College. No. V1.—Descriptions of Shells from the Gulf of 
California; by A. E. VERRILL. 
Havine in preparation faunal catalogues of the extensive 
collections of mollusca in the Museum of Yale College, col- 
lected in the Gulf of California by Capt. J. Pedersen, and at 
Panama, San Salvador, Peru, and other localities on the West 
Coast of America by Prof. F. H. Bradley, it seems useful to 
notice here some of the more interesting and new species. 
These will hereafter be more fully described and fi in the 
Transactions of the Connecticut Academy. Most of the follow- 
Mg species were obtained by pearl divers near La Paz. 
Semele Junonia Verrill, sp. nov. 
but or hos the plication become fainter, obl 
with the truncated posterior edge; interstices broadly con- 
cave, smooth, with fine radiating grooves in the larger speci- 
