34 CALIFORNIA ACADEMY OF SCIENCES. 



cess. Entire upper and anterior portion of the head 

 very porous. 



Eye 1-1 f in snout, 1J 2 in the interorbital, 4i-6 in. 

 the head. 



Maxillary barbels reaching to beyond origin of the 

 anal; mental barbels reaching hardly to the gill-open- 

 ing. Upper jaw slightly projecting, teeth all very fine, 

 villiform; the intermaxillary band shallowest in the 

 middle, becoming twice as deep on the sides, tapering 

 to a fine point behind; teeth on the 

 vomer in two separate elliptical 

 patches; palatine teeth in a similar 

 patch on either side, much longer 

 than the vomerine patches. 



Gill-membranes united and narrowly joined to the 

 isthmus. Gill-rakers very slender, 2-f-6. 



Distance of dorsal fin from tip of snout 3| in the 

 length, the spine granular toothed in front, IJ-IJ in 

 head, the filament reaching to the caudal, the ray fol- 

 lowing equal to the length of the head. Distance of the 

 adipose behind the dorsal fin 2J 2J in the length. 

 Caudal deeply forked, about 3J in the length. 

 Base of anal 3f-4J in the length, the highest ray 2J 

 in the base. 



Base of ventrals about equidistant between snout and 

 end of the anal fin, the ventral fin 1|-1| in the head. 



Pectoral spine 1| in the head, the filament reaching 

 beyond the origin of the anal. 



Dark purplish above, gradually shading into silvery 

 below, all the fins purplish, more or less thickly covered 

 with black dots, their tips sometimes dark purple; 

 sometimes the edge of belly and lower parts of sides- 

 with similar dots. 



Head 4}; depth 4f-6; D. I, 7; A. 32-35. 

 The specimens examined are from Sao Matheos; San- 

 tos; Para; Curuca; Pernambuco; British Guiana; Bahia. 



