﻿170 LEIDY'S DESCRIPTION OF REMAINS OF EXTINCT MAMMALIA. 



the peccary tribe, Platygonus compi-essus, Protocltosrus prismaticus, &c, in the lead 

 region of the vicinity of Galena, Illinois. 



Besides several phalanges, the fossil specimens alluded to consist of several fragments 

 of jaws and teeth. 



A small fragment of the upper jaw (figure 17, plate 17) of the left side contains 

 the fourth and fifth molars, which have the same form as the corresponding teeth of 

 Procyon lotor, but are about one sixth larger. 



A specimen of a right upper canine tooth has the same size as in the recent raccoon, 

 but is rather less compressed towards the subacute borders of the crown. (Figure 24, 

 plate 17.) 



A small fragment of the right side of a lower jaw, (fig. 19,) rather larger than the 

 corresponding portion of the same bone in the recent raccoon, contains the canine and 

 the fourth molar tooth. The former has the same form, as in the recent raccoon, and is 

 only a little larger. The latter tooth is not only larger than its representative in the 

 recent raccoon ; but it has the inner posterior ridge of the crown continuous with the 

 principal cusp and not terminating in a small cusp, and the tubercle at the outer 

 posterior part of the base of the principal cusp is hardly developed in comparison with 

 its condition in the recent raccoon. (Figs. 19, 20, 21.) 



An apparent, isolated, inferior, third molar tooth (figs. 22, 23) of the left side has 

 more nearly the form of the fourth one than of its homologue in the recent raccoon, and 

 it is also relatively larger in comparison with its associated succeeding tooth than in the 

 latter species. The principal cusp and that developed from its base postero-externally 

 are more distinctly separated than in the corresponding points of the fourth molar of the 

 recent raccoon. The anterior heel also is less developed and that posteriorly is less 

 exeavated than in the succeeding tooth of the recent raccoon, with which it is com- 

 pared in preference to the corresponding one of the latter species. The size and form 

 of the two fangs of the fossil tooth correspond with the same characters of the two 

 alveoli for the third molar in the fragment of a lower jaw above indicated. In con- 

 clusion it must be admitted that had this last described tooth been found alone it 

 would without hesitation have been viewed as a third inferior molar of Procyon lotor. 

 (Figure 22, plate 17.) 



Plate 17, fig. 17. — Outer view of the superior fourth and fifth molars of the right side of Procyon priscus. 

 fig. 18. — View of the triturating surfaces of the same teeth. 



fig. 19. — Fragment of the lower jaw of the right side containing the canine and the fourth molar, 

 fig. 20. — View of the triturating surface of the latter tooth, 

 fig. 21. — Inner view of the same tooth, 

 fig. 22. — Outer view of the left inferior third molar, 

 fig. 23.-^-View of the triturating surface of the latter tooth, 

 fig. 2t. — Outer view of the right superior canine. 



