120 The American Naturalist. [February, 
feet in the Phosphorites, C. (Schizotherium) priscum, that the 
finding of other Eocene types is not far off. In the meantime 
I have tentatively offered the suggestion that Chalicotherium is 
KOEI LIOR APR 
CATTERY 
N bat a PAA } 
ae Fey if Lae k 
en & ray i Wa 4 oa 
Fig. 1. Restoration of Chalicotherium. Modified from Filhol and Depéret. 
distantly related to Meniscotherium of the lower Eocene (Wa- 
satch), and that this may give us a clue to its zoological posi- 
tion. I will now expand and discuss this idea which may be 
expressed as follows: 
That the group to which Chalicotherium 
belongs was derived from the Condylarthra 
of the lowest Eocene, with affinities to the 
Meniscotheriidae and primitive Perissodac- 
tyla. It represents a distinct order, the 
Ancylopoda (Cope). The likeness tothe Ungui- 
culates and especially to the Edentata is dué 
to secondary adaptations and contains no 
proof of real affinity. 
The history of the discovery of this animal is as unique as its 
structure, and illustrates the uncertain path of the vertebrate 
paleontologist. We are indebted for a full résumé, to Dr. Ch. 
Depéret, who has fully discussed the bibliography, structure 
and relations of this genus in his admirable memoir. Until 
