142 CALIFORNIA ACADEMY OF SCIENCES. 



Head4-4i; depth about 5; Br. 7; D. I, 6; A. 10-12. 

 102. Ehamdella minuta. 



Rhamdia minuia Ltitkeu, Dan. Selsk. Skr. 179, pi. iii, fig. 6, 1875 

 (Kio dasVelhas); Eigenm. &Eigenm. Proc. Cal. Acad. 2d Ser. 

 i, 131, 1888 (Eio Janeiro; Macacos). 



Habitat: Kio Janeiro to Macacos. 



One specimen .083 m. Rio Janeiro. Dr. Emil Goldi. 



Two specimens .10 m., and .11 m. Macacos. W. M. Roberts. 



Body subterete, tapering, and somewhat flattened to- 

 ward the caudal. Head very short, smooth and covered 

 with skin above ; profile convex, transverse section 

 rounded. Occipital process reduced to a minimum, 

 about one-third as long as the pupil; fontanel long, ex- 

 tending from in front of the eye to the occipital process, 

 a bridge above the posterior part of the orbit. Some 

 long, simple pores about the head. 



Eye If in snout, 4| in head, 1 in the interorbital. 



Maxillary barbels reaching about to the end of the 

 dorsal fin; mental barbels to the base of the pectoral, 

 postmentals a little beyond. 



Snout rather broad and depressed, the width at the 

 rictus 2 in the head; greatest width of the head Ij in its 

 length. 



Intermaxillary band of teeth narrowed in the middle, 

 the greatest depth of the band about 5 in the width, the 

 teeth all alike, villiform. 



Branchiostegal membranes separate to in front of eye. 

 Gill-rakers about 3 + 10. 



Distance of dorsal from the tip of snout 2| in the 

 length, the dorsal spine produced in a filament, its 

 height with the filament about equal to the length of 

 the head; the rays rapidly decreasing in height to the 

 last, the free margin truncate. Distance of adipose fin 

 from the dorsal equals the length of the adipose fin, 5 

 in the length. 



Caudal forked, the upper lobe little longer than the 

 lower, less than 4 in the length. 



