506 CALIFORNIA ACADEMY OF SCIENCES. 134 
231. Symphurus williamsi Jordan & Culver, n. sp. 
Plate lv. 
Two specimens, the largest about 1% inches long, were 
obtained by Mr. Thomas Marion Williams in tide pools 
with sandy bottom, in very shallow water, near the estu- 
ary at Mazatlan. 
Head'4%; depth 3% 5 D. 93; -A.273;; scales 925) Body 
slenderer than in Symphurus plagiusa, which it much re- 
sembles, but not so slender as in Symphurus elongatus, 
and the caudal fin not black. Upper eye slightly in ad- 
vance of lower. 
Sand color in life; light gray, everywhere finely mottled 
with light and dark, with traces of a few very narrow 
dark-cross bands. Fins all mottled; the caudal and pos- 
terior part of dorsal and anal not black, scarcely darker 
than anterior part. 
Type numbered 2943, in the register of L. S. Jr. Univ. 
Mus. 
Family ONCOCEPHALIDA. 
232. Oncocephalus elater (Jordan & Gilbert). 
One specimen, the type of the species, presented to 
Dr. Gilbert by Dr. Bastow, then a resident of Mazatlan. 
It is found in deep water, and was not seen by us, but 
numerous specimens have been since dredged by the 
Albatross in localities further to the south, so that the 
species is now well known. 
