338 Bulletin American Museum of Natural History. [Vol. XXXIV, 
5382), and which Cope later doubtfully but correctly referred to his P. 
primevus. In a specimen of upper teeth from the same beds, which Cope 
referred to P. primevus, he mistook the second molar for the last, and of 
course the differences between this tooth and the type of P. omnivorus were 
obvious. 3 
Phenacodus trilobatus Cope! was established on a jaw fragment with 
P. primevus robustus 
(Type, Gray Bull 
beds, Bighorn ba- 
sin, Wyo.) 
P. primetus 
(Plesiotype, Cope 
skeleton, Gray Bull 
beds, Bighorn ba- 
sin, Wyo.) 
. Ng . 
: \ es : Eee ey E \ ei " 
A) ee Mis LS \ Vs 
ily fly? ee \ \ 
Nile el is ha A \oeee 
rt 
f - 
in, i 
ial lh i 
TO —_ aw “; 
P. primevus hemi- 
conus 
(Topotype, Gray 
Bull beds, Bighorn 
basin, Wyo.) 
NO. 1S 2E86 
Ais LG. 
P. intermedius . 
(Type, Gray Bull 
beds, Bighorn ba- 
sin, Wyo.) 
P. coper 
(Type, Gray Bull 
beds, Bighorn ba- 
sin, Wyo.) 
Fig. 7. Lower teeth, external views, of species of Phenacodis. 
1 Bull. U.S. Geol. and Geogr. Surv., 1881, p. 200. 
