BUNOTHEEIA. 
83 
and not low down, as in Creodonta. The head of the radius is rounder than 
in Creodonta. The skeleton of Tomitherium., in fact, bears a strong resem¬ 
blance to that of Chiromys, leaving the skull out of view. 
The skeleton of the New Mexican form includes an entocuneiform, like 
that of Stypolophus Mans, which indicates a non-opposable hallux. 
It is apparent that the supposed Lemurine Mammalia of the type of 
Tomitherium, which have the formula of the molar teeth 4-3, cannot be sep¬ 
arated by ordinal distinction from the Creodonta. They differ from them, it 
is true, in their wholly tubercular molar teetli, but in this relate to them as 
the Bears and Procyonidce do to other Carnivora. I pi«3pose, therefore, to 
constitute these a distinct group or suborder, intermediate in position be¬ 
tween the Creodonta and the Prosimice, under the name of the Mesodonta 
I cannot now find characters by which to distinguish this division from the 
Insectivora as an order. 
III. 
The remarkable type first introduced to the notice of paleontologists 
by Leidy, represented by the genus* AncMppodus, has been separated as a 
distinct order of Mammalia, under the name of Tillodontia, by Marsh, to 
whom we are indebted for a knowledge of many of its characters. He 
slates these to be, the possession of claws, plantigrade feet with five toes, a 
tliird trochanter of the femur, and separate scaphoid and lunar bones ; also, 
that the dentition is characterized by molars of the Ungulate type, small 
canines, and large scalpriform incisors in both jaws, faced with enamel, and 
growing from persistent pulps, as in the Podentia. He says this order 
‘‘seems to combine characters of the orders of Carnivores, Ungulates, and 
Rodents ”. 
Except in the dentition, the definition above given applies to the Cre¬ 
odonta; and an analysis of the dentition shows so many points of resem¬ 
blance as to render it probable that they pertain to the same order of Mam¬ 
malia; also, except in the incisor teeth, the characters given by Professor 
Marsh do not differ Rom those of the Insectivora. The structure of the 
superior molars is not inconsistent with the same order, and the small 
canines and large incisors are even more like those of most Insectivora than 
* Ainer. Jonrn. Sci. and Arts, 1875, 221. 
