302 
CARNIVORA. 
It is to be observed that six of tlie species have been derived from the 
Loup Fork beds and only four from the Lower Miocene or White Kiver 
beds, where they are associated with two species which have been referred 
to Amphicyon, Lart. 
Canis ?-. 
Canis vafer, Leidy, Cope, Atm. Rept. Chief of Engineers, 1875, ii, p. 988. 
Represented by an under jaw without teeth, which is scarcely suffi¬ 
ciently preserved to admit of certain determination. 
Canis lupus, Linn. 
Canis swvus, Leidy, Extinct Fauna Nebraska and Dakota, 1869, p. 28.—Cope, Ann. 
Rept. Chief of Engineers, 1875, ii, p. 988. 
Represented bj^ a portion of the left mandibular ramus, which contains 
the alveoli, or fragments, of the molars in front of the tubercular. This 
fragment agrees nearly with the corresponding part of C. lupus from Kan¬ 
sas, except in the nearer approximation of the canine to the first premolar. 
This character is seen in some of the domestic varieties of C. lupus. The 
ramus is a little more slender than in the specimen of the C. scevus, figured 
by Dr. Leidy. 
Measurements. 
M. 
Length of the premolar series. 0.045 
Probable length of the sectorial molar. 0. 024 
Depth of the ramus at the sectorial molar. 0. 026 
Depth of the ramus <at the second premolar. 0. 024 
Width of the ramus below the fourth premolar. 0. 011 
Canis wheelerianus, Cope. 
Plate Ixix, fig. 2. 
A left ramus of the mandible, lacking the portions below the condyle 
and in front of the canine tooth, furnishes the characters of this species of 
Wolf. Tlie length of the dental series is identical with that of the Canis 
lupus from Kansas; and the ramus is a little deeper, especially behind, and 
a great deal thicker. This increase in thickness is especially visible on the 
external side, which has two planes, a superior and an inferior; the dividing 
convexity between them extending from the anterior angle of the masseteric 
fossa to below the posterior mental foramen. The same aspect of the ramus 
in the Wolf is plane from the alveolar to the inferior border. The inner face 
