+ 
44 The Amblypoda. [January, 
A, Mandible unknown, 
Certain cervical vertebrz short and flat, as in Proboscidia .............obasileus, 
A, Symphysis of mandible.with four teeth on each side. 
a, Mandible without inferior expansion. 
Cervical vertebrz not very short; three premolars; lower incisors bilobate, 
Loxolophodon. 
aa, Mandible with anterior inferior expansion. 
Cervical vertebrze not short; three premolars Octotomus. 
aaa, Mandible expanded below, its entire length. 
Cervical vertebrze unknown; four lower premolars; four incisors, simple, 
athyopsis. 
AAA, Symphysis of mandible with three or two teeth on each side. 
Mandible with very narrow symphysis Uintatherium. 
In probably a majority of the species the lower jaw has a deep 
flange on its inferior border below the canine teeth, which serves, 
like the corresponding structure in the saber-tooth tigers, to pro- 
Fic. 27.— Uintatherium leidianum Osborn, skull left side, one-eighth nat. size; 
rom the Bridger beds of Wyoming. From Osborn, Memoir on Dainis and 
erium. 
Uintath 
tect the long superior canine tooth from lateral blows and strains 
(Fig. 27). In Bathyopsis this inferior expansion includes almost 
the entire inferior border of the ramus, giving an outline some- 
thing like that of Megatherium (Fig. 35). 
The genus Eobasileus was established on a species (Æ, pressi- 
cornis Cope) which is represented by a considerable part of the 
GPAI E S AAE eee EE 
