550 



PROCEEDINGS OF THE ACADEMY OF 



[Oct.,, 



peduncle 2f ; pectoral Ig; ventral If; snout 3f in head, measured 

 from upper jaw tip; eye 2f ; maxillary 2; interorbital 2|. 



Body moderately elongate, well compressed, deepest at dorsal 

 origin, profiles similar, predorsal slightly constricted, though not 

 keeled medianly, and other edges all convexly rounded. Caudal 

 peduncle well compressed, its least depth trifle less than its length. 



Head moderate, compressed, profiles similar, and flattened sides 

 but very slightly approximated below. Snout convex over surface 

 and in profile, short, its length about half its width. Eye large, 

 rounded, high, and hind pupil edge about midway in head length. 



Fig. 1,5. — Hyphessobrycon agulha Fowler. (Type.) 



Pupil large, circular. Eyelids free, not adipose-like. Mouth well 

 inclined, broad, commissure short. Maxillary long, slender, free, 

 well inclined, extends back about opposite front pupil edge. Lips 

 firm, moderate. Teeth mostly quindentate. Upper jaw with 8 

 teeth in each series, parallel and inner lower slightly larger. No 

 maxillary teeth. Mandible with 8 large quindentate teeth ante- 

 riorly, and along each ramus posteriorly row of small conic teeth 

 continued back, these all much shorter and contrasted with anterior 

 ones. Inner buccal folds broad. Tongue broad, depressed, rounded 

 and free in front. Mandible strong, slightly protrudes beyond 

 snout tip when closed, and rami not elevated inside mouth. Nostrils 



