SYSTEMATIC WORK. 
Ma nim. 35 
Macraucheniidce, from which it is distinguished by the forward 
position of the narial aperture, and the more elongated nasals. The 
skull is figured. 
E.— +ANCYLOPODA. 
e. t A rtionychimd. 
J Artionyx gaudryi , n. g. & sp., Osborn & Wortman, Bull. Amer. Mus. v, 
p. 5, White River Miocene, Dakota. While resembling Chalicotherium 
in having the terminal phalangcals in the form of largo, curved claws, 
this new form is distinguished by the general foot-structure being 
formed on the Artiodactyle rather than the Perissodactyle type. It 
is concluded that both Chalicotherium and Artionyx branched olf 
from the Ungulates before they had fully acquired their distinctive 
hoofs ; and it is suggested that while the one may have diverged 
from the Perissodactyle stock, the other may have been as closely 
related to the Artiodactyles. If, however, the Ancylopoda bo a 
natural group, then these forms will present a kind of parallelism 
to the Perissodactyles and Artiodactyles. It is further suggested that 
the S. American Homalodontotlierium may be a member of the same 
group. The paper concludes with an appendix on the mechanics of 
the Artiodactyle tarsus. 
In a later paper, Osborn, Amer. Natural, xxvii, pp. 118-133, further 
exemplifies the affinities of these forms, concluding that the Ancylo- 
poda are directly descended from the unguiculate Protungalata, and 
that from a side branch of the same main stem there arose, at an 
earlier stage, the Condylarthra , from which, through the Phenacodont- 
id(e, the Perissodactyla have originated. 
/. t C/HALICOTHERIID2E. 
| Schizotherium priscum , Gervais (= Limognitheriiim , Filhol), from tho 
Quercy Phosphorites, isshown by Filiiol, Ann. Sci. Nat. xvi, pp. 142 
et seq.j to be a Chalicotheroid, with three posterior and five auterior 
digits. 
F.— PERISSODACTYLA. 
g. Tapirid^. 
Earle, Science, xxi, p. 118, discusses the osteological characters of the 
feet of the Malayan and Brazilian Tapirs ; and concludes that the 
manus of the former is considerably more specialized than that of 
the latter, while in the pes there is less modification in the Brazilian 
than in the American species. 
■f Protapirus obliquidens and simplex , n. spp., Wortmann & Earle, Bull. 
Amer. Mus. v, pp. 162-168, White River Miocene, U.S.A. 
