494 CALIFORNIA ACADEMY OF SCIENCES. 



202. Awaous tajasica (Lichtenstein). Aboma de Rio. 

 Found in company with Philypnus lateralis, from which 



most fishermen scarcely distinguish it. It is rather 

 less abundant in the river, and was not noticed by us in 

 the Astillero. Elsewhere on the coast it has been recorded 

 only from the river at San Jose del Cabo in Lower Cal- 

 ifornia, where it was found by Mr. Lyman Belding and 

 more recently by Dr. Gustav Eisen. 



Comparison with specimens from Havana shows no 

 differences. 



203. Gobius soporator Cuvier & Valenciennes. Cai- 

 man. 



Found in abundance in all rock pools, ascending far- 

 ther above the low-tide mark than any other marine spe- 

 cies. It does not occur in fresh water. There seems to 

 be no difference between these specimens and those from 

 the Gulf of Mexico, where it is found everywhere in 

 water not exceeding two feet in depth. ^ 



204. Gobius sagittula (Giinther). 



A few small specimens, not over four inches in length, 

 found in the Astillero on muddy bottoms. It was also 

 taken by Dr. Gilbert at La Paz, Mazatlan and at Panama. 

 Gobius longicauda, described by Jenkins & Evermann 

 from Guaymas, is no doubt the adult of the same species, 

 as Dr. Gilbert has already indicated. 



Head 4^ ; depth 6^; caudal | longer than head; eye 

 2% in head; maxillary 2^; snout 3^; scales about 52, 

 the first 37 very small; dorsal VI-13; anal 14; skull w^ith 

 a median lengthwise ridge; interorbital space narrow, 

 channelled; skull somewhat broader behind; scales before 

 dorsal minute; head naked; scales ctenoid, much re- 

 duced anteriorly; lower jaw short, included; no flaps on 

 shoulder girdle; maxillary reaching to pupil; dorsal spines 



