114 CALIFORNIA ACADEMY OF SCIENCES. 



entire anterior margin with recurved notches; the pos- 

 terior margin with fine recurved teeth; the soft rays 

 broken in the specimens. 



Distance of the adipose fin from the dorsal fin IJ-lf 

 times as long as the base of the dorsal. Adipose fin 

 little longer than the dorsal fin. 



Tips of anal extending to the base of the caudal fin, 

 beyond the vertical from tip of adipose fin. 



Ventrals inserted little or not at all behind the vertical 

 from last dorsal ray, the rays divided for about half their 

 length giving the appearance of having 10 or more rays. 



Pectoral spine scimitar-shaped, very blunt and broader 

 at tip than at base, its inner margin with numerous short, 

 blunt teeth near its tip; outer margin with similar teeth 

 on its upper two-thirds, the basal third with longer, 

 pointed, recurved teeth; in the adult the teeth become 

 more or less obliterated; the spine is hollow, open at the 

 tip, a flexible prolongation of the spine nearly as long 

 as the spinous portion of the ray, which remains after 

 the leathery "skin" of the spine is removed. 



The specimens are mutilated, the fins having their 

 soft portions broken and the color washed out, except 

 traces of small dark brown spots on top of the head in 

 the larger specimen. 



Head 3f ; depth 5f-6f ; depth of peduncle 7J-8J; Br. 

 8-9; D. I, 6 in the smallest, I, 7 in the three larger 

 specimens; A. 9-10. 



78, Fseudopimelodus acanthochira, 



Psendopimelodus acanthochira Eigeiim. & Eigenm. Proc. Cal. Acad. 



Sci. 2d Ser. i, 122, 1888, (Gurupa; Tajapuru; Teffe; Jutahy). 

 Habitat: Amazon from Para to Tabatinga. 



Depth behind the humeral process less than the width, 

 tapering to the caudal peduncle. Head depressed, as 

 wide as long. Frontal fontanel not continued behind 

 the eye; an elongate occipital foritanel. Occipital process 



