58 MEMOIRS OF THE CARNEGIE MUSEUM. 



and three overlapping rows of scales between these and the occipital process; 

 occipital process extending about one-fifth to dorsal, bordered by three scales; 

 frontal fontanel long, pointed, about one-half as long as the parietal with its groove; 

 interorbital nearly flat, very broad; snout blunt, face of maxillary nearly vertical; 

 margin of second suborbital convex, leaving a narrow naked margin of nearly 

 equal width around its entire margin; postorbitals strong, leaving a narrow naked 

 margin; mouth minute; maxillary very broad and short, not reaching to below eye, 

 a little more than half as long as eye; maxillary-premaxillary border about three- 

 fourths as long as eye. Maxillary with one or two minute teeth; premaxillary 

 with four graduate teeth; mandible with six graduate teeth. Gill-rakers 5 + 8, 

 short. 



Origin of dorsal equidistant from tip of snout and base of caudal or a little 

 nearer the latter, its height equal to length of head to upper angle of gill-opening; 

 origin of anal under middle or behind middle of dorsal; ventrals just reaching anal; 

 pectorals reaching to ventrals. 



Scales very regularly imbricate, those of the belly with many sub-parallel 

 radial striae, those of the sides with divergent striae. 



A vertical humeral bar crossing the third and fourth scales of the lateral line; 

 an oval spot on the end of the caudal peduncle; region between nape, dorsal, and 

 anal nearly evenly peppered; region forward of a line joining base of ventrals 

 and the humeral spot silvery. 



Genus XV. Aphyocheirodon" gen. nov. 



Type : Aphyocheirodon hemigrammus Eigenmann. 



Teeth notched, in a single series, those in the maxillary and premaxillary 

 narrow, with nearly parallel edges, and with three or five cusps, the median one 

 prominent, the lateral ones small; premaxillary teeth about eight to ten in number; 

 maxillary teeth four or five on the upper fourth of the edge of the maxillary. Mandi- 

 bulary teeth much expanded at tip, the margins of neighboring teeth in contact, the 

 tip chisel-shaped, divided into three lobes of equal size, a minute cusp on each side. 

 Mouth large; cheeks partly naked; frontal fontanel very short; adipose fin well 

 developed; caudal naked; lateral line incomplete; scales with a few diverging radial 

 striae; no pseudotympanum. 



It is very probable that there is but little difference between the sexes, the 

 caudal fulcra being normal. Only one species is thus far known. 



'^ i.4>mi = a small fish; Cheirodon, a genus of this subfamily of fishes. 



