262 VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 



This species is about the size of the existing white-lipped peccary (Dicotyles 

 labiatus), but is much less formidably armed. 



Mylohyus pennsylvanicus Leidy. 



Dicotyles pennsylvanicus Leidy, Annual Report of the Geological Survey of Pennsylvania for 1887 (1889), 

 p. 8 ; PI. II, figs. 3-6. 



This species was described by Leidy from parts of both jaws of an individual 

 from the Hartman Cave in Central Eastern Pennsylvania near Stroudsburg. The 

 jaws bear the temporary dentition with the first true molar of both sides. The 

 permanent canines are half protruded ; I have extracted the crown of one of 

 these, with the crowns of the upper and lower first premolars. These specimens 

 show clearly the differences between this species and M. tetragonus. 



The inferior canine tooth has the crown much compressed, and with a narrow 

 triangular section, and is without the interior face seen in M. tetragonus. In the 

 first premolar the paraconulid is well developed, while it is wanting or extremely 

 rudimental in M. tetragonus. On the other hand the paraconule is absent from the 

 first premolar of the upper jaw, as in the last-named species. The paraconulid is 

 present in the first true molar of the inferior series, and presumably in the second. 



The specimens which I refer to this species in the Port Kennedy collection 

 belong to three individuals. The first consists of the anterior part of the left man- 

 dibular ramus, containing the first and second premolar teeth and the alveoli of the 

 third premolar and of the canine. The second consists of three lower true molars ? 

 the first premolar, and the inferior canine; and the third is a part of a lower jaw 

 containing the first and second premolars. In all of these teeth the paraconulid is 

 well developed. The canine does not display the internal face seen in M. tetra- 

 gonus, and the crown has a triangular section, but half of it is broken off. I have 

 not identified superior molars of this species, and it is possible that those I have 

 described under the head of M. tetragonus belong to it. As I do not possess the 

 maxillary bone of this species, I do not know whether it really belongs to M. penn- 

 sylvanicus or to M. nasutus. 



Measurements, No. 1. 



mm. 

 Length of diastema ; 66 



Diameters of pm. 2 



j anteroposterior; 11.5 



( transverse; 10 



tv . c (anteroposterior; 13.5 



Diameters of pi% { A l -. 



1 2 transverse ; • 12 



No. 2. 



Diameters of pm J anteroposterior; 

 1 1 { transverse ; 



Diameters of n V \ antero P osteriOT 5 

 1 \ transverse ; 



tv , p \ anteroposterior ; 



Diameters of m^ { , r 



6 \ transverse ; 



Diameter of c T at base of crown \ ;™ tero P oster ' 

 1 ( transverse 



14 

 13 

 16 

 13 

 23.5 

 14 

 fior; 12 



9 



