16 CALIFORNIA ACADEMY OF SCIENCES. 



fins; mental barbels not reaching postmentals, postmen- 

 tals less than interorbital width. 



Teeth villiform, in two narrow patches in each jaw. 



Coracoid processes converging backward, the margins 

 of the coracoid bone marked by prominent ridges, which 

 with the processes form a lyriform figure; the length 

 of the processes about equal to the space between them. 

 Humeral process extending to about the middle of the 

 pectoral spine. 



Pectoral pore large, slit-like. 



Skin everywhere covered with small warts. 



Distance of dorsal fin from tip of snout 2-J- in the 

 length. 



Pectoral spine reaching to tip of coracoid process, 

 both margins with strong hooks, strongest toward tip. 



Back mottled with light and dark brown; belly more 

 uniform brown; all the fins dark brown marked with 

 lighter. 



A. 6. Greatest width in front of the pectoral 3 in the 

 length. 



Two specimens .04-. 043 m. Jutahy. James, Thayer 

 & Talisman. 

 3, Bunocephalus verrucosus, 



Platystacus verrucosus Bloch, xi, 63, pi. 373, fig. 3. 

 Silurus verrucosus Bloch & Schneider, 379, 1801. 

 Aspredo verrucosus Cuv. & Val. xv, 442, 1840 (copied). 

 Bunocephalus verrucosus Giinther, Catal. v, 266, 1864 (copied). E. 



& E. Proc. Cal. Acad. Sci. 2d Ser. ii, 1889, 48. (Serpa.) 

 Habitat: Amazon, below the Madeira. 



Tail 4-angled, deeper than wide; body not greatly 

 depressed; depth of head at base of occiput somewhat 

 less than 1J in the space between tip of snout and base 

 of pectoral. Nuchal plate rather broad, its width at 

 base about 3| in its length, a transverse ridge at its base 

 turning abruptly backward and upward exteriorly; an- 

 other transverse ridge in front of this and connected 



