52 CALIFORNIA ACADEMY OF SCIENCES. 



Subterete, tapering to a long, slender, caudal peduncle; 

 the greatest width about equal to the greatest depth. 

 Head not much depressed; interorbital area flattish, the 

 greatest depth of the head If in its length; its greatest 

 width 1|— 1|; the width at the angle of mouth 2 in 

 its length; the surface of the cranial bones longitudi- 

 nally furrowed, covered with muscle and skin. Occipital 

 process more than three times as long as wide; anterior 

 fontanel elongate, its center over the middle of the eye, 

 continued as a very deep groove to the base of the occi- 

 pital process; a small opening a pupil's distance behind 

 the anterior fontanel, and a larger one in the occipital 

 bone at the end of the groove. Snout, upper part of 

 cheek and the opercle sometimes with conspicuous 

 reticulating mucous canals. Snout blunt, decurved. 



Eye 2 in snout, 7 in head, 4 in the interocular, 2 in 

 the interorbital. 



Maxillary barbels extending beyond base of pectoral, 

 mentals about to gill-opening, the post mentals about 

 one diameter of the eye farther. 



Jaws subequal, the upper longer; teeth all fine, villi- 

 form; intermaxillary band of teeth 

 very wide, its depth about 8 in its ^-^^ ^ "2 ]]^~-^ 

 width; two small patches on the vo- '-^-"'^^ ;^ CI>--^r~'^ 

 mer; palatine patches very wide and /^ ^-^ 



shallow, tapering to a point. 7 



Gill-membranes meeting at an acute angle, forming 

 a fold across the isthmus. Gill-rakers 3+10. 



Humeral process very thin, covered with skin, more 

 than half as long as the pectoral spine, broadly expanded 

 and rounded behind. Pectoral pore present. 



Distance of dorsal spine from snout 2|-2| in the 

 length; the dorsal spine broken off in all the specimens. 

 Distance of adipose from the dorsal 3|-3f in the length; 

 adipose fin as long as the dorsal fin, adnate. 



