1915.] 



NATURAL SCIENCES OF PHILADELPHIA. 



223 



Adipose eyelid covers eye completely. Mouth broad, crescentic 

 as viewed below, and jaws about even. A band of sparse villiform 

 teeth in jaws, narrow, continuous, though slightly expanded at 

 each end. Sparse villiform teeth in mandible, areas becoming wider 

 at symphysis, where separated by narrow naked median area. 

 Roof of mouth without teeth. Inner buccal folds moderate. Tongue 

 thick, depressed, smooth, little free. Barbels slender, maxillary 

 reaching f in pectoral spine. Mental barbels equally spaced, all 

 extend back about opposite pectoral origin. Anterior internasal 

 space slightly greater than posterior, nostrils all simple pores, an- 

 terior also very close to snout edge, and posterior little nearer eye 

 than snout tip. Occipital fontanel broad, extends up till little 

 beyond hind eye edge. Supraoccipital process extends to dorsal 

 plate, though both covered with thin skin and smooth. Opercle 

 wide, smooth. 



^MIjlJ I' J- l' . ' ■ ", T' ('W<^'W'i^» ■ ! ,. ! . l ,^.,.y,y ^ 









>#■ 



Fig. 6. — Auchenipterus ambyiacus Fowler. (Type.) 



Gill-opening extends forward about first third in postorbital region 

 of head. Gill-rakers about 10+23, slender, pointed, about f 

 length of filaments, and latter about IJ in eye. No pseudobranchiae. 

 Branchiostegals slender. 



Skin smooth, no rugose areas. Shoulder-girdle at base of pectoral 

 spine slightly swollen. Humeral process short, pointed, slender, 

 covered with skin, and extends about first third in length of depressed 

 pectoral spine. Axillary pore not evident. L. 1. obsolete at present, 

 apparently continuous along side indicated by vertebral centra. 



Dorsal small, well anterior, inserted slightly nearer anal origin 

 than snout tip, spine slender, nearly straight, front edge smooth and 

 hind edge slightly serrated. Adipose fin small, inserted about last 

 fourth in space between dorsal origin and caudal base, fin about 



