94 CALIFORNIA ACADEMY OF SCIENCES. 



spine rather slender, high, 1J in head; distance of adi- 

 pose from the dorsal fin 3J in the length; adipose fin as 

 high as long, its posterior margin wholly free. 



Lower caudal lobe somewhat the wider, the upper lobe 

 l|-lf in head. 



Anal fin emarginate, the. highest ray 2f in the head. 



Ventrals truncate, 2-f 2-J in head. 



Pectoral spine 1-f in head, outer margin roughened, 

 inner margin with recurved teeth. 



Bluish gray above, silvery below; dorsal and caudal 

 slightly dusky, other fins plain; barbels dusky. 



Head 3J; depth 5J-5f; Br. 5; D. I, 7; A. 23. 



Two specimens, $ .285 m. and .29 m. Panama. Stein- 

 dachner. 



SUBFAMILY CALLOPHYSINJE. 

 X. CALLOPHYSUS. 



Callophysus Miiller & Troschel, Horse Ichthyol. iii, 1, 

 1849 (sp.) 



Callophysus Bleeker, Nederl. Tijdschr. Dierkunde i, 

 101, 1863 (macropterus) . 



Pimelotropis Gill, Proc. Acad. Nat. Sci. Philad. 1859, 

 196 (later alls = macropterus). 



Pseudocallophysus Bleeker, Nederl. Tijdschr. Dier- 

 kunde, i, 102, 1863 (ctenodus = macropterus). 



Type, Pimelodus macropterus Lichtenstein. 



This genus is distinguished by its dentition, having 

 but one series of teeth in the lower and two series in the 

 upper jaw. Inner series of teeth concealed or partly con- 

 ,cealed,the teeth being much smaller than those of the outer 

 series. The first dorsal and pectoral rays not spine-like, 

 longer than the following rays. Adipose fin long. A 

 wedge-shaped fontanel between the eyes, and a circular 

 one at the base of the occipital crest. 



This genus has been divided into three different 



