1912.] 



NATURAL SCIENCES OF PHILADELPHIA. 



19 



soid, about midway in mouth length, without eyelid. Mouth rather 

 large, nearly horizontal and not completely closing. Lips tough, 

 rather thin, smooth. Teeth all conic and sharply pointed, mostly 

 inclined a little back, and edges entire. Upper teeth in complete 

 uniserial outer row, this extending entirely around jaw, all erect, 

 anterior to eye more strongly convex and robust than behind eye, 

 where more inclined back and somewhat compressed. Anterior 

 to eye in upper outer series several teeth a little enlarged or slightly 

 canine-like, one also at upper jaw tip. In front of upper jaw before 

 eye, and inside erect outer teeth, about 3 series of 7 enlarged and 

 more or less depressible conic canines. These arranged as 2 outer 

 series approximating in front, with each containing 3 teeth, and a 

 median posterior one, latter largest of all teeth in mouth and entirely 

 depressible back. Beginning below eye front inside outer erect 



Fig. 4. — Murcena myrialeucostictus Fowler. Type. 



teeth series of 6 rather slender and larger depressible palatine teeth 

 each side of vomer. Latter with irregular biserial row of short conic 

 strong teeth, smaller than upper lateral teeth. Mandibular teeth 

 mostly uniserial, like upper outer erect teeth. Anteriorly in mandi- 

 ble about 3 pairs of sub-depressible conic and slightly enlarged 

 teeth, first pair begins close behind or at symphysis. No tongue. 

 Mandible shallow, curved, surface convex, tip equal in front with 

 snout tip, rami low, and profile a little more inclined than that of 

 snout. Front nostril in short tube above front eye edge in inter- 

 orbital space. Latter evenly convex. 



Gill-opening little below median axis of body, nearly horizontal, 

 length a little more than eye. Pharynx well swollen, and with few 

 obsolete shallow grooves. 



