399 
by afoot, which was found nearly entire, with three metatarsal bones and 
a supernumerary bone, and which appeared to belong to p. medium. 
Although the structure of this foot does not so materially differ from 
those of the animals of the present day as that of the Anoplotherium 
does, it approaching somewhat to the tapir, it is still undoubtedly of 
a structure at present unknown. That the hind foot of the animal, 
considered as P. magnum, was tridactyle, was evinced by the form of 
a fossil astragalus of this animal. The foot which appeared to belong 
to the species P. minus agreed with the preceding in having three 
metatarsal bones, and a supernumerary bone, but was not larger than 
that of a fox. 
Besides those bones of the hind feet which are referable to the pre- 
ceding species, a tridactyle foot was found, rather less than that of a 
hog, and shorter and thicker than that which is attribted to the P. me- 
dium, and was therefore considered as belonging to P. crassum. 
An astragalus was found which materially differed from that of 
known animals. It approached the nearest to that of the tapir ; but 
it differed from it obviously in several points, and from its thickness 
was supposed to belong to the last-mentioned species. 
The quarries of Paris also supplied M. Cuvier with the tibia of P. 
medium. He also obtained the tibiae of P. magnum, P. minus, and 
P. crassum ; and was able to determine, that in these animals, and in 
those of the genus Anoplotherium, the fibula was complete and dis- 
tinct, as well as in the other pachydermata. 
We have seen that the teeth, as well as the feet, point out an ana- 
logy between this animal and the rhinoceros and tapir, and M. Cuvier 
has been able to show an equal correspondence in the os femoris. 
Three species of quadrupeds, the rhinoceros, tapir, and the solipedes, 
are distinguished from the others by a third trochanter, or a strong 
apophysis on the outer edge of the bone, below that which is known 
as the great trochanter. In the fossil os femoris, this third trochanter 
is rounded and blunt ; but made a little hooked forwards, and is placed 
