562 



PROCEEDINGS OF THE ACADEMY OF 



[Oct., 



mouth. Nostrils together, large, close before eye, anterior simple 

 pore and posterior broadly crescentic. Interorbital broadly convex. 

 Preorbital narrow. Infraorbital broad, smooth, large, completely 

 €overs cheek. Hind edge of premaxillary entire, well inclined for- 

 ward. Opercle smooth, rather broad, and hind edge scarcely emar- 

 ginate. Top of head with large fontanel, begins on interorbital 

 nearly opposite front edge of nostril and extends back to occipital 

 process. Latter short and triangular. 



Gill-opening extends forward opposite front pupil edge. Rakers 

 3+9, lanceolate, slender, nearly twice length of filaments or about 



Fig. 19. — Gnathocharax steindachneri Fowler. (Type.) 



\ of eye diameter. Isthmus narrowly constricted, surface convex. 

 Branchiostegals rather short, subeciual. 



Scales rather large, cycloid, well exposed in lengthwise series, 

 those on predorsal rather oblique and somewhat more imbricated, 

 and all of more or less uniform size. Caudal base scaly. Row of 

 small scales along base of anal anteriorly. No axillary ventral scaly 

 flap. L. 1. incomplete, comprises six simple tubes or series of scales 

 from shoulder, each tube only extending over first half of scale 

 exposure. 



Dorsal origin about opposite eye centre and caudal base, first 

 branched ray longest, and depressed fin extends slightly over half 



