1911.] 



NATURAL SCIENCES OF PHILADELPHIA. 



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outer series, tricuspid, smaller than in inner series, and with median 

 cusp enlarged. Inner upper teeth quadricuspid, each tooth having 

 2 small inner cusps and an enlarged cusp next to small external cusp. 

 Mandibular teeth similar to last, large, uniserial, and 10 in number. 

 No other teeth in mouth. Tongue depressed or flattened, rounded 



ill 



Fig. 2. — Apodastyanax stewardsoni Fowler. Type. 



or free in front. Mandible small, strong, well protruded before snout 

 tip, rather short. Nostrils together, close before eye above. Inter- 

 orbital slightly convex. Postero-infraorbital broad, width about 

 | of eye. Other suborbitals all narrower. Preopercle ridge slightly 

 inclined forward, its hind edge vertical. Opercle width 1^ in eye. 



Gill-opening forward about opposite front eye edge. Rakers. 

 9 + 14, small, thin, slender, 2h in eye. Filaments 2 in eye. Pseudo- 

 branchiae not evident. Isthmus narrowly constricted in front.. 

 Branchiostegals about 6, well compressed and rather broad. 



Scales cycloid, all well exposed in longitudinal series parallel with 

 1. 1., not extending on fins except few on caudal base. No axillary 

 pectoral scaly flap. L. 1. complete, a little decurved at first, then 

 straight and midway along side of body to caudal base medianly. 

 Tubes in 1. 1. simple, each extending well over exposure of scale, though 

 not quite reaching its hind exposed edge. 



