1916.1 



NATURAL SCIENCES OF PHILADELPHIA. 



391 



Body elongate, rather robust forward, deepest at ventral origin, 

 well compressed, predorsal region moderately depressed and abdomen 

 somewhat pot-bellied. Caudal peduncle somewhat large, elongate, 

 least depth but slightly over half its length. 



Head small, depressed above, convex below and profiles alike. 

 Snout broad, depressed above, and length (in profile) about half 

 its width. Eye rounded, rather high, and about midway in head 

 length. Eyelids free. Premaxillaries greatly protractile. Maxil- 

 lary little free, vertical, mostly concealed, and not reaching eye. 

 Mouth small. Lower jaw rather weak, slightly protrudes, and at 

 unison of rami rather weak, shallow. Teeth small, uniform, simple, 

 conic, in a single row and flexibly fastened at bases. Lips rather 



Fig. 1. — Poeciliopsis maculifer Fowler. 



thin. Tongue small, depressed, free in front. Nostril close above 

 upper front eye edge. Interorbital flattened. Preopercle ridge 

 inclined slightly forward. 



Gill-opening extends forward about opposite hind pupil edge. 

 Rakers about 16 short weak points, about § of filaments, and latter 

 about half of eye. 



Scales large, cycloid, narrowly imbricated, largest on upper surface 

 of head, and become small on caudal peduncle behind. Scales on 

 breast and belly but little smaller than those on sides. Caudal base 

 with several irregular rows of small scales. Several rather large 

 pores or pits on head above, one directly behind upper hind edge of 

 eye. Mucous channel, opening by several pores, along edge of pre- 

 opercle. Side of snout with several smaller pores. 



