SOUTH AMERICAN NEMATOGNATHI. 139 



98, Rhamdella notata, 



Pimelodus notatus Schomburgk, Fish. Brit. Guiana, i, 181, pi. 7 

 (Fort St. Joaquim on the Kio Branco); Giinther, Cat. Fish. 

 Brit. Mus. v, 131, 1864 (copied). 



Rhamdia notata Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. i. 129, 



1888 (name). 

 Habitat: Eio Branco. 



The type of this species was over a metre long. 



99, Rhamdella eriarcha. 



Rhamdia eriarcha Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. i, 



129, 1888 (Kio Grande do Sul). 

 Habitat: Rio Grande do Sul. 



A single specimen .26 m. from the Emperor's collec- 

 tion made at Rio Grande do Sul. 



Body elongate slender, the width below the dorsal 

 spine less than the depth. Head long, pointed, the 

 fontanel continued to base of the occipital process which 

 reaches about half way to the dorsal spine. Entire sur- 

 face of the head covered with skin. Head flattish above, 

 snout long and pointed, the width at the angle of the 

 mouth 2-f in length of head. 



Eye large, its center one-third or one-fourth nearer 

 the posterior margin of the opercle than to the tip of the 

 snout, 2 in snout, 4J in head; the interorbital less than 

 the diameter of the eye. 



Maxillary barbels extending to the edge of the opercle; 

 postmental barbels not reaching edge of branchiostegal 

 membrane if drawn straight back. 



Upper jaw projecting. Lips thick and strongly pli- 

 cate. Intermaxillary band of teeth deep and narrow, 

 the teeth minute. No teeth on vomer or palate. 



Teeth of the lower jaw in a narrower band which 

 tapers backward, the teeth similar to those of the upper 

 jaw. Gill membranes separate to below middle of eye. 

 Gill-rakers 1+5. 



Distance of dorsal fin. from end of snout 2-f in the 

 length; the first ray of the dorsal scarcely spine-like, 



