HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. - 215 
cotheres. Dr. Gregory in his recent valuable work upon ‘‘The Orders of Mam- 
mals”’ has clearly pointed out this fact. The Meniscotheriide are now accepted 
as a family of the Condylarthra. 
Oligotomus osbornianus Cop, Proc. Am. Phil. Soc., Vol. XX, p. 182 (1881) was 
made the type of the genus Ectocion by Cope, American Naturalist, Vol. XVI, 
p. 522, and is now referred to the Phenacodontide. 
Genus SpHENOC@LUS Osborn, Bulletin American Museum of Natural History, 
Vol. VII, p. 98 (1895). 
The specimen, to which Dr. Osborn gave the specific name uintensis, came 
from Wagonhound Canyon, Uintah County, Utah. The specimen consists of the 
posterior portion of a cranium, which Dr. Osborn with hesitation and doubt referred 
provisionally to the Chalicotheriide, but which, until more and better material is 
obtained, must be regarded as incerte sedis. 
SYSTEMODON Cope, gen. nov., American Naturalist, XV, p. 1018 (1881). 
The type of the genus selected by Cope was Hyracotherium tapirinum, which is 
now referred to the Equide. 
Systemodon semihians Cork, Proc. Am. Phil. Soc., Vol. XX, p. 184 (1881). This 
species is now referred to the Tapiride. 
CHAPTER III. THE SPECIES OF THE CHALICOTHEROIDEA. 
It is not the purpose of the brief resumé which we are giving in this part of this 
memoir to do more than indicate the salient facts as to our present knowledge of 
the classification of the Chalicotheroidea, nevertheless it has appeared to us that 
it may add value to this paper to incorporate at this point a list of the species of 
the Family Chalicotheriide which have hitherto been named. This is done 
without positively affirming anything as to their validity, except in the case of 
those species, which are accepted as genotypes. This is more particularly true 
in the case of the European species. To have undertaken to look up all the types, 
often fragmentary, and in some cases specifically unidentifiable, which are scattered 
through European collections, would have required more time than has been at 
the command of the senior author, when in Europe. In reference to the species of 
American origin we can speak more confidently. 
