558 



PROCEEDINGS OF THE ACADEMY OF 



[Oct., 



Head rather small, well compressed, profiles similarly and slightly 

 convex, and flattened head sides slightly constricted below. Snout 

 convex over surface and in profile, length about f its basal width. 

 Eye large, rounded, slightly elevated, centre about first f in head 

 length. Eyelid free, without adipose-like development. Pupil 

 rounded. Mouth broad, with short commissure. Maxillary largely 

 free, slender, well inclined, extends back slightly beyond front eye 

 edge, though not quite to that of pupil. Lips fleshy, not free. 

 Upper teeth biserial, outer row of small unevenly arranged teeth in 

 a wavy line and deeply imbedded, appearing as single cusps or 

 tricuspid, the outer cusps being quite small. Inner upper row of 



Bryconatnericus smithi Fowler. (Tj'pe.) 



t(.eth large, broadly triangular, quincuspid, 6 in number. No 

 maxillary teeth. Mandibular teeth uniserial, quincuspid, and 

 .suddenly stopping along front of rami, so that posterior teeth, if 

 present, very small. Mandible moderate, included so snout slightly 

 protrudes beyond closed jaws, convex, and rami not elevated inside 

 mouth. Inner buccal folds moderate. Tongue depressed, rounded 

 and free in front. Nostrils together close before upper front rim of 

 eye, anterior simple pore and posterior much larger and broadly 

 crescentic. Interorbital broadly convex. Suborbitals large, espe- 

 cially infraorbital, and completely 'covering cheek. Hind preopercle 

 ridge nearly vertical, entire. Opercle deep, smooth, its upper pos- 

 terior edge not emarginate. Occipital fontanel broad, extends 



