264 MEMOIRS OF THE CARNEGIE MUSEUM 
posterior base, Ms? present, heavy and elongated tail, imbs and feet well proportioned and 
sub-digitigrade as in Daphenus and Daphenodon, little or no retractility of the unguals. 
GENERAL DESCRIPTION AND SPECIFIC CHARACTERS. 
The material represents a fully adult animal judging from the much worn 
canine. The latter is oval in cross-section and is proportionally larger than that 
tooth in Daphanodon. Judging from the abraded anterior face of the canine it is 
quite evident that 12 was of large size asin Daphwnodon. The postero-external 
angle of the canine is also worn by the contact with the upper canine. As in 
Fiq. 59. Caudal Vertebra of Borocyon robustum. } nat.? 
Fia. 58. Right Side of Lower Jaw-fragment and Crown size. No. 1918. 1, lateral and ventral views of caudal 
View of Teeth of Borocyon robustum. Nat. size. No. 1918. 7; 2, lateral and ventral views of caudal? 9. 
Daphoenodon there is a short diastema back of the canine. P+ is single-rooted. Pz 
is low-crowned and has the protoconid placed more anteriorly than in Daphanodon, 
which results in a less developed anterior and greater posterior base than on Py 
in the latter genus. There is no posterior tubercle on Py as in Alwrodon, but the 
cingulum is well developed ; it surrounds the tooth and is smooth on the external 
side, while internally it is slightly mammilated. There is a large mental foramen 
directly under the posterior portion of Pz. The symphysis is quite heavy and 
extends well back as in Daphanodon. 
The only parts present representing the vertebral column in the type are a 
number of caudal vertebre from different regions of the tail. The centra of these 
vertebre are long and heavy, indicating a tail of approximately the same propor- 
tions as that of Daphenodon. 
The manus is represented by a complete trapezoid, Me. I, and other fragments. 
The trapezoid is depressed and wide transversely, indicating a broad manus. ‘The 
P p , 
