1847.] OWEN ON EXTINCT ANTHRACOTHERIOID QUADRUPEDS. 131 
The characters are as follows :— 
UNGULATA. 
I. Artiopactyia*, Hoofed Quadrupeds with toes in even number, 
as two (fig. 1) or four (fig. 2), and which have a subdivided or 
complex stomach (fig. 3), and a moderate-sized simple czecum 
(fig. 4). Ex. Ox, Hog, Peccary, Hippopotamus. 
Fig. 1. 
Fig. 3. Fig. 4. 
Artiodactyle characters. 
II. Pertssopactyiat. Hoofed Quadrupeds with functional toes, 
on the hind-foot, in uneven number, as one (fig. 7) or three 
(fig. 8), and which have a simple stomach (fig. 9) and an 
enormous or complex cecum (fig. 10). Ex. Horse, Tapir, 
Rhinoceros, Hyrazx. 
Perissodactyle characters. 
* ” Aprtos, par, OaxTuXos, digitus. 
T Teprocodaxrvnos, ‘ qui digitos habet impares numero.’ 
