132 CALIFORNIA ACADEMY OF SCIENCES. 



Width below the dorsal spine about equal to its depth r 

 tapering to the caudal peduncle. Head rather short and 

 broad, its width 1J in its length. Skin of the head very 

 thin, the surface of the bones little if at all roughened; 

 snout flat and broad, its width at the angle of the mouth 

 2 in the head. Fontanels in the young three: 1, a 

 small round one at the base of the occipital process 

 present in the largest specimen; 2, a small one be- 

 hind the orbital bridge obliterated in the adult, and 3, 

 the usual one between the frontal bones. Occipital 

 process continued to half way to dorsal spine. Numer- 

 ous groups of pores about the head; a group behind the 

 posterior nasal opening, a larger group between the 

 middle of the eyes; a group above the posterior margin 

 of each eye and a group behind each of these; a group 

 behind the eye; one at the upper angle of the opercle 

 another near its lower angle, other groups below the eye 

 and elsewhere. 



Eye in smallest specimen 1J in snout, 5 in head, 1J 

 in interorbital; in largest specimen 2$ in snout, 6J in 

 head, 2 in interorbital. 



Maxillary barbel extending scarcely beyond the end of 

 the dorsal fin in the largest specimen, to its middle in 

 some of the smaller specimens; mental barbels reaching 

 to the base of the pectoral, postmentals to the middle of 

 the pectoral. 



Mouth wide terminal; in the largest specimen the 

 jaws are equal, in the smaller the upper jaw projects. 

 Teeth of the lower jaw as usual; those of the upper jaw 

 in a band of uniform depth, 7 times wider than deep, 

 interrupted in the middle. 



Gill membranes separated to below the angle of the 

 mouth; gill-rakers 2+7. 



Distance of the dorsal fin from tip of snout 3 in the 

 length; the fin not longer than high; highest ray 1J-1J 



