_Tomitherium_, Cope, Vert. Bridg. Eoc. Wyom., p. 2, 1872.
_Limnotherium_, Marsh, Am. Journ. Sci., 1871, ii., p. 43 (in part).
This genus, which is allied to _Adapis_, is characterised by {121}having
its lower incisors with cutting edges; the first and second lower
pre-molars with one root; the third with one cusp and a posterior heel, and
the fourth an interior lateral cusp in addition. The lower true molars have
two anterior cusps (the inner being double) and two posterior. The thigh is
long and the knee free from the body as in the _Anthropoidea_, the hand
capable of turning freely upwards at the wrist; the hind-limbs longer than
the fore-, and "the details of the lower jaw, which is co-ossified in the
centre, and teeth similar to that of the lower Monkeys." The remains of the
only known species, T. ROSTRATUM (Cope), which was about the size of the
Capuchin Monkey (_Cebus capucinus_) of Brazil, were found in the Bridger
(Eocene) beds in an isolated spot on Blacks' fork, Wyoming.