EXTINCT MAMMALIA OF NORTH AMERICA. 385 



tooth described by him from the same locality, and referred to a cetacean with the 

 . name of Sqrialodon protervus or Gynorca proterva, is clearly an upper canine of the 

 same animal. The canine is smaller than the corresponding tooth of &\\y recent or 

 extinct Peccary I have hitherto seen. The enamel is worn at the fore part of the 

 crown, exposing a wide band of dentine extending the entire length. In its perfect 

 condition the crown has been about three-fourths of an inch in length by about four 

 and a half lines in breadth at base; and in this position is three lines in thickness. 



Of the specimens from Charles County, Md., referred by Prof. Cope to D. torqua- 

 tus, one is an inferior canine, probably belonging to the same individual as the former 

 tooth. The enamel is completely worn off to the base posteriorly. In its present 

 condition the crown is 10 lines long, 4 lines broad and 3i lines thick at base, which 

 measurements are nearly those of the unworn tooth. 



Another specimen, accompanying those just noticed, is a portion of the left ramus 

 of the lower jaw of a young animal, containing in functional position the last tempo- 

 rary molar and the succeeding first true molar, the former but little worn, the latter 

 inappreciably so. A second specimen of a first true molar appears to have belonged 

 to the opposite side of the same individual. 



The two specimens of first true molars resemble the corresponding teeth of Dico- 

 tyJes torquatus, but unlike those we have seen, are devoid of any trace of tubercles 

 between the principal lobes of the crown, externally as well as internally. The teeth 

 are smaller than in most skulls of the D. torquatus to which I have access, but are 

 larger than in one of them. The antero-posterior diameter of the fossil teeth is 5J 

 lines, the transverse diameter 4i lines. In the small recent skull of D. torquatus 

 alluded to, the corresponding tooth measures 4f by 3i lines. A similar tooth from 

 the shores of Ashley River, South Carolina, also devoid of a tubercle between the 

 lobes of the crown externally as well as internally, measures 7 by 5 J lines. 



The condyle of the young fossil jaw fragment differs from that in specimens of the 

 adult jaw of D. torquatus in its greater extent fore and aft, compared with its 

 breadth, and in its less degree of convexity. 



Dicotyles nasntus. 



See plate XXVIII, Figs. 1. 2. 

 Extinct Peccary, Leidy : Proc. Ac. Nat. Sc. 1860, 416. 

 Dicotyles namius, Leidy : Proc. Ac. Nat. Sc. 1868, 230. Cope : Ibid. 1869, 3. 



An extinct species of Peccary, certainly different from Platygonv^ compressus, is 

 indicated by a specimen submitted to my examination by the late Dr. David Dale 

 Owen. It was found at the depth of between thirty and forty feet below the surface, 

 in digging a well, in Gibson County, Indiana. It is represented in figures 1, 2, plate 

 XXVIII, and consists of the fore-part of the upper jaw, containing on one side the 



49 



