1901.] NATURAL SCIENCES OF PHILADELPHIA. 331 



Liver. — Exceedingly large, occupyiug the greater part of the 

 abdominal cavity. Both lobes are equal. 

 4. Galeus mento (Cope). 



Mustelus mento Cope, Proc. Amer. Philos. Soc, XVII, 1877, p. 47. 



No. 21,104, Type of Mudehis merito Cope. Pacifi<; Ocean at 

 Pecasmayo, Peru. Coll. of Prof. James Orton, 1876-77. Prof. 

 E. D. Cope. 



Body elongate, slender, and tapering much after the first J)., 

 whei'e the greatest depth is located. Head large, with a flattened 

 snout which is pointed. The interorbital space is broad, broader 

 than the snout. Eye of moderate size, lateral, and its anterior 

 margin over the tip of the mandible. Posterior to the eye and 

 very near its posterior edge is the spiracle which is furnished with 

 small pseudobranchise. The nostrils are each furnished with a flap. 



The snout anterior to the mouth is greater than the space between 

 the external borders of the nostrils, and it is also greater than the 

 width between the external corners of the mouth. The teeth are 

 smooth, rounded and rhombic. Mouth furnished with a broad 

 flattened tongue, and there are also two entire buccal flaps at the 

 bases of the jaws. Gill-slits 5, about equal, and the last above 

 the base of the P. Origin of the first D. about over the middle 

 of the P. The fin itself is large, and its base is greater than its 

 height. It has a posterior projection, the tip of which seems to 

 me to be slightly in advance of the origin of the V. The origin 

 of the second D. is much in advance of that of the A., and its 

 posterior base is about over the last third of the base of the A. 

 The base of the second D. is much greater than the height of the 

 fin, and it is also furnished with a posterior projection which is 

 attenuated. The middle of the first D. is about midway between 

 the posterior root of P. and anterior root of the V. The P. very 

 broad, and flattened. The space between the inner edges of the 

 bases of the P. less than the width of the mouth. The V. broad 

 and blunt, and without inner posterior projections. The A. is very 

 small and with a sharp posterior projection. Caudal notched. 

 Lateral line present, its course somewhat deeurved posteriorly in 

 the region of the second D. 



The coloration is not entirely uniform as described by Prof. Cope. 

 The general color of the body is a leaden -brown, somewhat 

 darker dorsally. There are sevei-al bands of dark blackish-brown 



