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POPULAR SCIENCE REVIEW. 
Ungulates, and Kodents. In Tillotherium (Marsh), the type of 
the order, the skull has the same general form as in the bears ; 
but in its structure resembles that of the Ungulates. The 
molar teeth are of the Ungulate type, the canines are small, 
and in each jaw there is a pair of large scalpriform incisors 
faced with enamel, and growing from persistent pulps, as in the 
Rodents. 
eanines, 
1 
1 
The adult dentition is as follows : incisors, - ; 
3 3 2 
; premolars, - ; molars, _. The articulation of the 
O 
lower jaw with the skull corresponds to that in Ungulates. The 
posterior nares open behind the last upper molars. The brain was 
Fig. 3. 
Skull of Anchippodus ( Tillotherium fodiens, Marsh), from Marsh, 
“Am. Journ. Sci. and Art,” 1876, Plate VIII. 
small, and somewhat convoluted. The skeleton most resembles 
that of carnivores, especially the Ursidce ; but the scaphoid and 
lunar bones are not united, and there is a third trochanter on 
the fermur. The radius and ulna, and the tibia and fibula, are 
distinct. The feet are plantigrade, and each had five digits, all 
terminated with long, compressed, and pointed ungual pha- 
langes, somewhat similar to those of the bears. The other 
genera of this order are less known, but all apparently had the 
same general characters. There are two distinct families, Tillo- 
theridce (perhaps identical with Anchippodentidoe ), in which 
the large incisors grow from persistent pulps, while the molars 
have roots ; and the Stylinodontida ? , in which all the teeth are 
rootless. Some of the animals of this group were as large as a 
