Eigenmann: New and Rare Fishes from South America. 81 



five-pointed teeth In the inner series; mandible with four five-pointed 

 teeth and about eight abruptly smaller, mostly conical teeth on the 

 sides; maxillary with one or two teeth. Gill-rakers about ii + i6. 



Origin of dorsal little nearer tip of snout than base of caudal, its 

 highest ray 3.4-4 in the length; adipose scaled on its basal half, pre- 

 ceded by a short dermal ridge; caudal lobes about as long as the head; 

 origin of anal equidistant with origin of dorsal from the end of the 



Fig. 2. Predorsal spine of Stethaprion crenatiis Eigenmann. (Greatly enlarged.) 



lateral line; margin of anal slightly rounded, without a lobe; ventrals 

 about equal to the postorbital part of the head, their origin equidistant 

 between tip of snout and origin of the dorsal; pectorals almost as long 

 as head, reaching beyond the line joining origins of dorsal and ventral. 



Fig. 3. Scale of Stethaprion crenatus Eigenmann. (Greatly enlarged.) 



Scales covering all but a narrow fringe of the caudal and anal; 

 concentric free edges of the scales crenate; the scales symmetrically 

 arranged except over anal musculature. No distinct markings. 



