228 University of California Publications. [Zoology 



examined the type of Gillichthys guaymasiae Jenkins and Ever- 

 mann. It is without doubt referable to this species, thouoh it is 



larger than any we have seen. Quiet ida y-cauda is found from 

 Vancouver Island (Jordan & Starks, 1895, p. 839) to Guaymas, 

 Mexico (the type locality), and is everywhere abundant on the 

 mud tlats southward. 



203. Ilypnus gilberti (Eigenmann and Eigenmann). 

 (Jordan & Evermann. 1898, III. p. 2253.) 



This foim Avas taken in abundance in San Diego Bay in com- 

 pany with Quietula y-cauda and Clevelandia ios. It has a con- 

 spicuous dark metallic spot on the opercle. which is never absent 

 either in fresh or alcoholic material, and serves as a convenient 

 means of identification. It differs from Quietula y-cauda in hav- 

 ing only one, rarely two, dermal flaps on the inner edge of the 

 shoulder girdle, in having the occipital region of the cranium 

 transversely smooth and rounded, and in being more slender and 

 more uniformly colored. From Clevelandia ios it differs in hav- 

 ing Haps instead of papillae on the inner edge of the shoulder 

 girdle, and in being generally darker. 



The dorsal has nearly always 5 spines, occasionally 4, and 15 

 or 16 rays; the anal has usually 15 rays, sometimes 14, and rarely 

 16. Most specimens do not have enlarged dark spots, the entire 

 body and fins being dusted over with fine dark points, which form 

 a more or less complete network of broken lines, but occasional 

 specimens have from 3 to 6 large dark spots along the base of the 

 dorsal. The anal is dark toward the tips of the rays, and is with 

 or without a white border. The type which we have examined 

 has the usual dark spot on the opercle, and a dark anal, but some 

 specimens from the type locality do not have the latter character. 

 Specimens from Shoal Point, Colorado Eiver; Conception Bay, 

 L. C. : and San Bartolome Bay have less color than our San Diego 

 specimens, especially on the anal. 



This species is known from San Pedro south to the Gulf of 

 California. 



