THE EXTINCT PECCARY OF NORTH AMERICA. 103 
as characterizing Protochoerus prismaticus. In comparison with the last molars of Dico- 
iyles torquatus, represented in figures 1 and 3, plate 37, it would be considered to belong 
to the lower jaw, but in comparison with the corresponding teeth in the cave head, figures 
5 and 7, it would certainly be viewed as belonging to the upper jaw. 
As indicative of the smaller size of the incisors of Dicotyles compressus, in comparison 
with those of the recent peccaries; representations of the following specimens, presented 
by Dr. Kittoe, are given in plate 6, accompanying this communication. Figure 4, an an- 
terior view of the first superior incisor of the left side; figure 5, a view of the upper right 
lateral incisor; and figures 6, 7, lateral views of the first and second inferior incisors. The 
third inferior incisor, of the cave head, of D. compressus is represented in figure 19, plate 
37, vol. X. of these Transactions. 
List of remains of the extinct Peccary, (DicoryLES CoMPRESSUS,) observed by the author.— 
1. An almost perfect skuil accompanied with the lower jaw, entirely unchanged in tex- 
ture. It was discovered in a saltpetre cave in Kentucky, and was presented to the Ame- 
rican Philosophical Society, in 1805, by Dr. Samuel Brown; and is now deposited in the 
cabinet of the Academy of Natural Sciences. It has lost a portion of the nasal bones, the 
incisors of both jaws, and one upper canine. On both sides it contains all the permanent 
molars, of which the premolars and the last true molar were just ready to be protruded. 
On one side in the upper jaw, three temporary molars are retained, but all the other 
series are lost, though they had not yet been shed. Trans. Am. Phil. Soc. 10, 342, plates 
35, 36, 37, figs. 5—8. Referred to Huchoerus (Protochoerus) macrops. 
2. Fragment of the right side of the lower jaw, of an adult individual, containing the 
last two molar teeth. Trans. Am. Acad. Arts and Sci. UL, pl. 3, fig. 7; Trans. Am. Phil. 
Soc. X., pl. 58, fig. 3; pl. 57, figs. 9, 10. Referred to Platygonus compressus. 
3. Hragment of the face, of a young animal, containing three premolars and portions of 
both canines. Trans. Am. Ac. Arts, IIL, pl. 1, 2, fig. 5 a.; Trans. Am. Phil. Soc. X., pl. 
38, fig 2; pl. 57, fig. 11. Referred to Platygonus compressus and Hyops depressifrons. 
4. Upper portion of the cranium. Tr. Am. Phil. Soc. X., pl. 38, fig. 1. Referred to 
fyops depressifrons, and Dicotyles depressifrons. 
5. Three imperfect series of upper molars, from two individuals. Tr. Am. Acad. IIL, 
pl. 8, figs. 12, 13,13; Tr. Am. Phil. Soc. X., pl. 37, 12—15. Referred to Platygonus 
compressus, Dicotyles depressifrons, Hyops depressifrons. 
6. An upper canine. Tr. Am. Acad. III., pl. 3, figs. 9—11; Tyr. Am. Phil. Soc. X., 
pl. 57, fig. 16. Referred to Platygonus compressus. 
7. Fragments of a frontal and malar bone, a dorsal and lumbar vertebra, the lower por- 
tion of a humerus, the left fore-arm bones, and a cuboid and metatarsal bone. Tr. Am. 
Acad. IIL, pl. 2, figs. 4, 5, b., 6; pl. 5, fig. 14; pl. 4. Platygonus compressus. 
