1883. ] On the Extinct Dogs of North America. 245 
—Jaws of <a Bae three- 
a-b, Æ 
tetes aal size. 
anus Cope, upper and aap dental series, 
lacking t the last me anlar. All three- 
oup Fork beds 
of Koata Neea ka 
of the otters, cannot yet be 
Fic 
From: the John Day bed 
gests an a 
the $k 
Hy2ocyon Cope. 
BPRS 
g IL 
Lo 
Original. 
ENHYDROCYON Cope. 
This genus is represented by 
a single rather large species, the 
E. stenocephalus Cope. The gen- 
eral form of the skull is that of 
Temnocyon, but the shortening 
of the muzzle is carried so far as 
to leave space for only three 
Superior premolars. These have 
posterior lobes as in Canis, and 
the first is two-rooted. The 
muzzle is broad and flat above, 
and the brain-case is long and 
narrow. The general form of 
_ the skull would be that of an ot- 
ter, but for the presence of a high 
sagittal crest (Fig. 12). Whether 
or not it is the ancestral source 
ascertained. Its appearance sug- 
—— 
n stenocephalus, skali two views, one-half natural size. 
sof Oregon. Origin al. 
quatic habit. Were the muzzle of similar proportions, 
ull would be as large as that of a wolf. 
The dental Series is still more reduced in this genus than in the 
