eigenmann: the cheirodontin^. 49 



teeth, none of which is notched, and still another has either five or six, none notched; 

 mandibular teeth similar to the maxillary teeth and nearly of the same size. 



Origin of dorsal very little nearer base of middle caudal rays than tip of snout; 

 origin of anal under some part of the base of the dorsal, its base longer than head; 

 ventrals just about reaching anal or not quite to anal; pectorals reach to the 

 ventrals, which are inserted in advance of the vertical from front of dorsal. 



Fig. 13. Macropsohijcon uruguayance Eigenmann. 6896 CM., a, b, c, outlines of premaxillary, 

 maxillary, and mandible. 



Scales have been mostly lost, best preserved in smallest specimen; very reg- 

 ularly arranged, and apparently absent from caudal. Interhsemals of caudal 

 peduncle few and feeble. 



Color uniform, an ovate dark spot on middle caudal peduncle. 



This species has the most feeble dentition of any of the members of the 

 Cheirodontinse; its conical teeth would place it outside this subfamily, but its 

 relationships are unmistakable. 



Genus XIII. Megalamphodus-* Eigenmann, gen. nov. 



Type : Megalamphodus megalopterus Eigenmann. 



Mouth large, teeth in part notched, in part conical, in a single series, seven to 

 eleven on the premaxillary, two to twenty on the maxillary; four to eight tricuspid 

 teeth along front of mandible, minute ones on the sides; all the teeth narrow and 

 pointed, those of front of mandibles, most of those of premaxillary, and usually 

 the upper ones of the maxillary, each with a minute notch on the sides, the rest 

 conical; maxillary teeth few or along almost the entire edge; fontanels both very 



^* ij.eya\aiJi<i>o5os = with spacious ways. 



