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^ ; D.93; A. 73; scales 92. 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 ONCOCEPHALID^. 



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. 



