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PROCEEDINGS OF THE ACADEMY OF 



[June, 



Body robust, compressed, back but little elevated so that upper 

 profile would form an obtuse angle at origin of dorsal, and lower profile 

 more or less evenly convex. Greatest depth at origin of dorsal. 

 Caudal peduncle compressed, and its length about | its least depth. 



Head compressed, convex on upper surface, and sides constricted 

 below. Greatest width in postero-supraocular region, and upper 

 profile nearly straight or only a trifle concave. Snout short, convex, 

 rather broad, and rounded when viewed from above. Eye circular, 



Fig. 14. — Prochilodus theraponura Fowler. 



anterior, and a trifle above middle of depth. Eyelid narrow. Jaws 

 even, a little broad, and together with mouth and nostrils like in pre- 

 ceding species of Prochilodus. Interorbital space convex, and median 

 fontanel extending from internasal region to occiput, broader. Post- 

 orbital largest in suborbital rim. Mucous channels on cranium later- 

 ally not pronounced. Opercle with indistinct curved transverse striae. 

 Gill-flap apparently narrow. 



Gill-opening extending forward a little in advance of posterior margin 

 of orbit. Rakers none. Gill-filaments equal, about f length of orbit. 



