224 University of California Publications. [Zoology 



from Todos Santos Island, Mexico, agree in all essential respects 

 with the description of the type (7, p. 73) , but show the following 

 variations; the measurement appearing first is of the San Cle- 

 mente specimen. Head 3i/4 and 3% in length to base of caudal; 

 depth 43^ and 414. Eye 31/0 and 3% in head. Dorsal VI, 12 and 

 13 ; and 10 and 9. Cross-bars on head and body 16 and 15. 



This is a strongly marked goby and may be at once known by 

 its color. It has narrow cross-bars on head and body, and a nar- 

 row cross line through each interspace between the bars. It is 

 known from the Galapagos Islands (Snodgrass and Heller. 1905, 

 p. 416), but has not been taken between that region and Mexico. 



198. Gobionellus sagittula (Gunther). 

 {Gobius sagittida Jordan and Evermann, 1898, III, p. 2228.) 



Several specimens were taken in a brackish slough in San 

 Diego Bay near Old Town. It has not been hitherto recorded 

 north of the Gulf of California. Small specimens a couple of 

 inches in length have a larger eye and a shorter caudal than the 

 large ones, agreeing in all respects with the original description 

 by Gunther (1861, p. 372). Large specimens up to four inches 

 in length agree with the description by Jordan and Evermann, 

 but have 58, not 66 series of scales. 



This goby is very widely distributed, being found in brackish 

 water southward to the coast of Ecuador (Starks, 1906, p. 799). 

 The adults may be at once distinguished from any other goby in 

 our region by the long, pointed caudal. It reaches a length of 8 

 inches. 



199. Lythrypnus dalli (Gilbert). 



{Gobius dalU, Jordan and Evermann, 1898, III, p. 2230.) 



A single specimen li/o inches in length taken at San Pedro. 

 It differs somewhat from the description of the type (Gilbert, 

 1890, p. 73). The soft dorsal is longer, having 20 rays rather 

 than 17 ; the spinous dorsal is elevated in front, the spines grow- 

 ing gradually shorter posteriorly. The longest spine reaching to 

 base of seventh ray, not the first two produced, reaching beyond 

 middle of soft dorsal ; the caudal is as long as the head, not less 



