28 



crushed, and lacking some portions, with full set of upper 

 molars and canines. (3) A great number of fragmentary spe- 

 cimens of different parts of the body. 



Dentition. — In the upper jaw the incisors are arranged in a 

 semi-circle as in P. palndosus ; they have long fangs and short, 

 conical crowns, with a decided basal ridge, which is very 

 strong in the third. They mcrease from first to third, which 

 is very large and pointed. 



The canines have very large and long fangs (longer than 

 the crowns). The crowns are very stout and pointed, consti- 

 tuting formidable weapons. In section they are nearly circu- 

 lar, with a distinct hinder margin and a slight recurve. A 

 rudimentary anterior margin is sometimes present, and of the 

 faces thus marked off, the inner is much smaller and flatter. 

 The general direction is forwards, downwards, and slightly 

 outwards. There is a diastema of about half an inch be- 

 tween the incisors and canmes. 



Premolars. — T\\Q hrst is very small, about half an mch 

 from the canine, simple and conical, with an obscurely marked 

 basal ridge, and two heavy fangs. 



Further description of the upper dentition is unnecessary, 

 owing to the complete work of Dr. Leidy upon the subject. 



The lozvcr incisors are placed in a semi-circular row, and 

 are somewhat procumbent, though hardly as much so as in the 

 tapir. They are much as in P. pahidosus, but are relatively 

 smaller, and have not such distinct basal ridges ; features 

 which indicate a departure from the carnivorous type, and a 

 nearer approach to the herbivorous type. The lateral incisor, 

 though the largest of the series, is not so large nor so pointed 

 as in P. palndosus. There is no diastema. 



The canines are about equal in size to those of the upper 

 jaw, growing from stout fangs and permanent pulps. The 

 margins of the crowns are more decided, and are smooth, 

 leaving a very narrow and flat inner face. A feeble basal 

 ridge. When the jaw was closed, the lower canines passed 

 inside and in front of the upper. 



The first premolar stands immediately behind the canine, 

 is longer than that of the upper jaw, consisting of a single 

 pointed lobe implanted by one fang, slightly recurved with a 

 flat inner and convex outer face. Passing in front of the 



