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, w^hich 

 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 wath small warts. 



Distance of dorsal fin from tip of snout 2^ 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. 



Platijstarn.v i^e/rucosus 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 1^ in the space between tip of snout and base 

 of pectoral. Nuchal plate rather broad, its width at 

 base about 3i 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 



