Temnocyon and Hypotemnodon. — TSyermtin. 283 
The surface for the alveoli of the dentition of the ramus of 
Dapha&nus is nearly level or flat, but in Temnocyon it inclines 
upward and backward with an easy curve from mTT. In the 
former the curve, which is rather sharp, commences at the 
posterior of mTa. The diameter of the ramus from the posterior 
end of the dentition to the point where the bone curves up- 
ward to the condyle is 88 mm. in T. ferox and 53 mm. in Da- 
phcenus. A horizontal line drawn along the base of the 
dentition will in T. ferox pass below the condyle and in 
Daphosnus above it and the coronoid process i- less anterior 
to the condyle than in the former species. (The mandible 
as a whole approaches nearer to that of the living C. famil- 
iaris than to that of Daphrnnus.) 
The limb bones of Daphamus which are available for com- 
parison are the humerus, ulna and femur and these indicate a 
skeleton of smaller size than the skull would lead us to expect ; 
however this is true also of Temnocyon but in a less degree. 
The shaft of the humerus is slender and not so erect as in 
T. ferox, but curves backward. Judging from the position of 
the head of the proximal extremity the articulation with the 
scapula must have taken place at a greater backward angle 
than in Temnocyon\ the deltoid ridge is well developed and 
there is an epicondylar foramen. The distal trochlea appears 
to be much lower and more primitive. 
The ulna is slender and does not curve backward as in 
Temnocyon : the diameter of the sigmoid cavity is L3 mm. and 
of the shaft at this point 11 mm. The articulation with the 
radius is lateral, rather than anterior as in altiyenis or ferox. 
The shaft of the femur is slender and is compressed antero- 
posteriorly throughout its entire length, which is 145 mm.: 
the head is well rounded and has a diameter of 11) mm.; the 
neck is thick; the greater trochanter is placed on a level with 
the head and is well developed ; the lesser trochanter is but 
12 mm. below the head; a third trochanter is present :5:5 mm. 
below the apex of the greater. 
Dr. Scott in his table (No. <">. p. 7r> ) shows the descent of 
Temnocyon (as well as Cynodeifmus) from Daphcenus, and it is 
evident from the above comparison that the later John Day 
