308 CALIFORNIA ACADEMY OF SCIENCES. 



Body elongate, compressed, the width, under the dor- 

 sal fin, 11 in the depth. Head depressed, covered with 

 skin, the snout spatulate. Fontanel continued as a 

 groove to the base of the occipital process. Occipital 

 process joined to the dorsal plate; bones of the skull 

 striate. 



Eye lateral, 2-3 in snout, 5-6 in head, 3-3| in the in- 

 terocular. 



Maxillary barbels simple, concealed, not reaching to 

 the end of the intermaxillary bone. 

 Teeth as in A. valenciennesi, the depth /\^^^ — -0\ 

 of intermaxillarv band little more ' ^ ^ ^ 



'J. - N 



than half a diameter of the eye. 

 Cleft of the mouth 2|-2| in head. 

 Length of snout about equal to inter- 

 ocular width. 



Gill-membranes confluent with the skin of the isthmus 

 posterior to the eyes. Gill-rakers short, 7+14. 



Pectoral pore small. Lateral line zig-zag, branching. 



Distance of dorsal spine from snout 3|-3| in the 

 length; the spine slender, flexible, crenate in front, 

 roughened near the tip behind, its length 2 in the head; 

 distance between the adipose and dorsal fins less than 2 

 in the length. Adipose fin high and short, shorter than 

 the dorsal fin. Caudal forked, 4h-5 in the length. 



Origin of the anal fin slightly nearer the rictus than 

 to base of the caudal. 



Ventral fins lA-2 in the head, reaching the anal fin. 



Pectoral spine roughened on its outer margin, serrate 

 on inner margin, long and slender, l.\-2 in the head. 



Back purplish, top of head marbled with purplish and 

 whitish; base of caudal purplish; otherwise plain light. 

 In the young the color is more marked; the inner sur- 

 faces of the ventrals, and more especially the pectorals, 



