248 



PROCEEDINGS OF THE ACADEMY OF 



[Apr., 



Head small, compressed, upper profile slightly concave from 

 snout to occiput, lower profile a little more inclined, and flattened 

 sides but very slightly constricted below. Snout convex over surface 

 and in profile, broadly convex as viewed from above, and its length 

 about half its width. Eye rounded, placed about first | in head. 

 Adipose-eyelid little developed, only extends on eye a little in front 

 and behind. Mouth broad, shallowly cleft, and latter falling on 

 level with upper edge of pupil. Maxillary nearly vertical, reaches 

 opposite front of eye, slender, and greatest expansion about ^ of eye. 



Fig. 8. — Gymnocorymbus nemopterus Fowler. (Type.) 



Lips firm, moderate. Mandible, when closed, very slightly pro- 

 truding, and moderate rami not elevated in mouth. Upper teeth 

 biserial, quincuspid, and inner row larger. No maxillary teeth. 

 Teeth in lower jaw uniserial, median largest, and similar to upper 

 teeth. Tongue broad, depressed, free, and rounded in front. Nos- 

 trils together, anterior circular and its hind cutaneous rim exposes 

 larger posterior in crescent with its frenum falling over front eye 

 edge. Interorbital evenly convex. Posterior infraorbital broad, 



