278 



PROCEEDINGS OF THE AC.'UJEMY OF 



[Apr., 



and in profile, basaj Avidtli about f its length. Eye large, rounded, 

 superior, its centre falling slightly before middle in length of head, 

 and eyelids or edge free. Pupil circular, rather large. Mouth 

 rather wide, small, or with short slightly curved and nearly horizontal 

 commissure. Muzzle moderate, not especially protruded, and jaws 

 equal. Premaxillary protractile. Maxillary rather small, extends 

 well back towards eye beyond posterior nostril, though not quite 

 to eye, well inclined and curved down below lower lip. Lips rather 

 fleshy, form rather broad, free fold along each jaw edge. Jaws with 

 villiform and nearly uniform teeth, arranged in band in each. Appar- 



Fig. 19. — Apistogiytnnua ortmnnni rupumini Fowler. (Type.) 



ently no other teeth. Buccal folds inside mouth moderately wide. 

 Tongue depressed, slightly pointed, and free around front edge. 

 Mandible rather shallow, rami a little elevated inside mouth pos- 

 teriorly, and surface convex. Nostrils small, anterior larger, about 

 last third in snout length, and posterior inconspicuous, superior, and 

 slightly before eye front, also slightly nearer together than outer 

 pair. Interorbital convex. Hind preopercle edge nearly straight, 

 slightly inclined backward. Membrane along hind edge of gill- 

 opening moderate. 



Gill-opening extends forward about last | or nearly opposite hind 



