470 Bulletin American Museum of Natural History. | [Vol. XXXIV, 
the enlarged lower front tooth are also more characteristic of Insectivora than 
of Primates. But among the Eocene Tarsiide certain genera show an ap- 
proach to these peculiar specializations of Muicrosyops sufficient to suggest 
relationship, save for the double-rooted upper canine, and the absence of 
. this peculiarity is not demonstrated except in Tetonius (and of course 
Tarsius itself). 
I conclude that there is no satisfactory evidence either for or against 
Primate affinities and in default of such evidence have left the two genera 
Cynodontomys and Microsyops in the Mixodectidee to which they were 
referred by Cope, Osborn and Wortman. As Mvixodectes is certainly not a 
Primate and is very probably an insectivore, these Eocene genera must 
come provisionally under the order Insectivora. 
Cynodontomys Cope 1882. 
Type, C. latidens Cope, from the Lysite horizon, Wyoming. 
The three species included under this genus show a progressive molariza- 
tion of pg and increase in size, but there are no clearly defined progressive 
C. scotttanus 
(Lost Cabin) 
N0«.l44969 
Aa. /. 
St 
C. latidens 
(Lysite) 
No. (469 5~ 
ALT, 
C. angustidens 
(Gray Bull) 
No. 15073 
4 AA 
Fig. 41. Outlines of the lower jaws, outer view, of the three species of Cynodontomys. 
All twice natural size. ‘ 
