902 The Condylarthra. 
< Dental formula, I. 3; C: 1; Pm.4; M. 8; without diastema 
Incisors and canines in both jaws small. The superior molars of 
this genus have some resemblance to those of Hyopotamus, but 
the inferior molars are different, and of the Anchitherium type. 
The temporary last superior molar differs from its successor, the 
permanent fourth premolar, in its more complex character. Tt is in 
fact identical in structure with the true molars. The second and 
third milk molars differ from their successors in their greater 
anteroposterior extent. The third has an internal lobe opposite 
the posterior half of the external wall (Fig. 25, 4c). : 
ee 
size. 
;4 
25.— “api ee «shinite parts of crania, hare nat. 
Fion. the Wasatch epoch of New Mex Fig. a, cranium from peti 
‘do. No. 2 from below 5 c; do, No, 3, aifepiayiig deciduous pme; im and! Tay 
ie Weis can: from Report U. S. Geol. Survey Terrs., oo Rs v. H 
Ouits widely open posteriorly. Palate excavated betiveen the 
molars posteriorly. A postglenoid process. Auricular we 
widely open below. Post-tympanic and paroccipital 
united. Occipital and sagittal crests. Foramen ovale 
‘separated from f. lacerum anterius. Mandibular sya ” 
sified. Mandibular condyle uplooking. Brain not so ay 
in Phenacodus. | 
The cervical vertebra are, like those of Phenacodus, of neti 
have 
length and slightly opisthoccelous. They, with the lumbars, 
