380 CALIFORNIA ACADEMY OF SCIENCES. 8 
nearly complete have been sent to the British Museum 
and to the Museums at Vienna and Berlin. Partial sets 
are in the Academy of Sciences at San Francisco and in 
the U.S. National Museum. It is evident that the list here 
given is by no means a complete record of the fishes of Si- 
naloa. Doubtless all the species enumerated from Sonora 
by Gilbert, Jenkins and Evermann, and by Gilbert and 
others from Lower California, will ultimately be found in 
this region. Every day spent at Mazatlan either by Dr. 
Gilbert or by ourselves brought some addition to the list, 
and the deep water fishes have not been studied at all. 
Besides our obligations to Mr. Hopkins, and to the vol- 
unteer assistants above named, the writers wish to express 
their especial indebtedness for local assistance to Dr. 
George Warren Rogers, a scholarly physician resident at 
Mazatlan; to Senor Ygnacio Moreno, the leading fisher- 
man of the port, whose efforts in aiding our work were un- 
wearying. We also owe many favors to Messrs. William 
W. Felton, Bert L. Smith, John L. Kendall and J. Rip- 
pey, American residents in Mazatlan. From Dr. Charles 
H. Gilbert, in whose laboratory the present paper has been 
written, we have received much valuable aid in many 
ways. 
The plates accompanying this paper have been drawn 
by Miss Anna L. Brown, artist of the Hopkins Labora- 
tory. 
The following species are here described as new to 
science. The numbers after each name are those borne 
by the type specimens on the register of the Museum of 
Leland Stanford Jr. University. 
Pristis zephyreus Jordan & Starks. (Skin.) 
Narcine entemedor Jordan & Starks. 1699. 
Urolophus rogersi Jordan & Starks. 1700. 
Urolophus umbrifer Jordan & Starks. 
Pteroplatea rava Jordan & Starks. 1587. 
