1903.] NATURAL SCIENCES OF PHILADELPHIA. 751 



several (5?) more on latter; 24? scales in a transverse oblique series 

 between origin of spinous dorsal and that of ventral ; width of head 4 

 in its length; depth of head 31; mandible If; second dorsal spine 3^; 

 least depth of caudal peduncle 6; ventral 3|; snout 2^ in head, meas- 

 ured from tip of upper jaw; eye 6; maxillary 2§ ; interorbital space 7. 



Body rather slender, not especially elongate, not especially com- 

 pressed, but more or less cjdindrical. Caudal peduncle compressed, its 

 least depth about 3^ in its length. 



Head elongate, slender, attenuate, somewhat compressed, and be- 

 coming a little constricted below. Profiles similar, and nearly straight. 

 Snout long, slightly convex above, with two frontal ridges, approxi- 

 mated at first, then more distant posteriorly, and continued well up 

 to top of head behind eyes. Eye moderately large, orbicular and its 

 lower margin about § of distance in depth of head at that point, ^[ax- 

 illary falling far short of front of orbit, hardly reaching opposite pos- 

 terior nostril. Distal expanded extremity of maxillary equal to about 

 I orbital diameter. Mandiljle produced w^ell beyond upper jaw, and 

 with a slightly fleshy tip. Teeth uniserial in jaws. Enlarged, com- 

 pressed and fang-Hke below, and in sides of upper jaw short, fine, num- 

 erous and sharp-pointed. A single large fang at symphysis of mandible 

 and four large canines in front of upper jaw. A single series of teeth 

 on each palatine, consisting of several large compressed fangs in front, 

 and giving place to small teeth, like those in upper jaw, posteriorly. 

 Tongue long, slender, pointed, free mostly in front, and with its upper 

 surface finely asperous. Lips rather broad and thin at corners of 

 mouth. Nostrils rather near together, well in front of and about level 

 with upper margin of eye. Interorbital space a little less than eye, 

 and slightly elevated convexly. 



Gill-opening extending forward till a little behind front rim of orbit. 

 Rakers absent, replaced by minute asperities. Pseudobranchiae a 

 little shorter than filaments, which are a trifle less than half orbital 

 diameter. Isthmus roimded. 



Scales small. Head more or less covered with small scales, obsolete 

 at present on opercle, where they may have fallen, and those on cheek 

 small. Scales on trimk mostly fallen. Bases of soft dorsal, anal and 

 caudal with small scales, especially first rays of former two fins. There 

 they become minute and crowded. Lateral line straight, inclined from 

 upper edge of gill-opening to middle of base of caudal, and consisting 

 of rather large simple tubes. Scales mostly remain throughout its 

 course. 



Spinous dorsal inserted a trifle before origin of ventral, nearer tip 



