1889.] Geology and Pal(Sontology. 153 
the Chalicotheriidai must be referred to a distinct order of 
unguiculate Mammalia, which I propose to call the Ancylo- 
poda, with the above definition. Two genera belong to the 
single family, the Chalicotheriids ; viz., Chalicotherium 
Kaup, and Ancylotherium Gaudry. In the former, the pha- 
langes are distinct ; in the latter the first and second are coOs- 
sified (Lydekker). Marsh has not yet shown how his genus 
Moropus differs from Ancylotherium. The species described 
by Marsh under this name are from the Loup Fork bed of 
Kansas. 
Perissodactyla. 
Haplacodon angustigenis. Cope, gen. nov. Metiodus angiis- 
tigenis, Cope, Annual Report, G. N. H. Survey, Canada, 1885. 
C, p. 81. 
Char. gen. Additional specimens of the species described, 
as above cited, show that it cannot be referred to the genus 
Menodus, but that it belongs to the family Lambdotheriidae 
(Chalicotheriidai <?//w) as at present defined. It differs from all 
the genera of the Menodontida; in the presence of but a single 
internal cusp of the first (posterior) superior premolar, a fact 
which renders it highly probable that the premolars which 
precede it in the maxillary bone, were similarly constituted. It 
differs from all other genera of Lambdotheriidse and also from 
Diplacodon, to which it is allied, in the presence of but two 
inferior incisors on each side. It is not certain whether it pos- 
sesses horns or not. 
Menodus sp. Cope, Ann. Report, 1. c. p. 83. 
This species is allied to the AI. gigantciis Leidy, but whether 
identical or not can not be yet ascertained. 
Anchitheriuni ivestoni sp. nov. 
This species is represented by a single superior molar, and 
two inferior molars, the latter in place in a part of the mandi- 
ble. The teeth are smaller than those of the A. bairdii, from 
which they also differ in their greater transverse as compared 
with their anteroposterior diameters. The intermediate tuber- 
cle of the posterior crosscrest is more distinct than that of the 
anterior, and the posterior intermediate cingular cusp, so 
prominent in the A. bairdii, is here wanting. The posterior 
cingulum- continues round the internal base of the posterior 
internal cusp. Diameters of superior molar ; transverse, 13.5 
mm.; anteroposterior, 10 mm. Diameters of inferior molar ; 
transverse, 8 mm.; anteroposterior, 10.5 mm. This species, 
interesting for its primitive character in the absence of the 
