798 The Condylarthra. [ August, : 
very slightly opisthoccelous. The caudal vertebrae are quite 
robust, indicating a powerful tail. Dorsals not found, 
The tuberosities of the humerus are small in proportion to the 
size of the head. The condyle is much like that of a creodont, 
with internal flange and external cylinder, without intertrochlear 
crest or ridge. The internal epicondyle is large, and is pierced 
above by an epitrochlear foramen (Fig. 72). The olecranon is com- 
ra 
"i 
Ip a in 
Fic. 6.—Periptychus rhabdodon Cope, cervical vertebra of individual ice 
figs. cd f, which belong to another ss e 
Fig. a,atlas; 4, axis; c d e f, third to sixth cervicals; all fro Original 
3 
hook and the spine rises abruptly from the neck (Fig. 74). i 
In the P. rhabdodon the femur is not materially larger pr 
humerus. The great and little trochanter are well — al | 
the third trochanter is situated low down, as in Phenaco us, | 
not opposite the little trochanter as in Creodonta (Fig. er 4 
Portions of two posterior feet preserved display five ™ nae 
and several phalanges. The distal carina of the former ji but 
gulate, 
i arrow for an un 
rior and weak. The latter are rather n stal ones are 
are not elongate, and are rather depressed; ee Eas usual i0 
more robust, and are rather more narrowed distally digt 
of an exter! r 
Ungulata, and the neck of a broken phalange ' t 
is nearly round in section, The third digit 1$ longes 
