_Menotherium_, Cope, Bull. U. S. Geol. Surv. Territ., 1874, i., p. 22.
_Laopithecus_, Marsh, Am. Journ. Sei., 1875, i., p. 240.
This genus was established on an under jaw from the Lower Miocene
White-river beds of Nebraska. Its molars are successively larger from
anterior to posterior; the two pairs of cusps are obliquely opposite, the
hinder pair longer than the front pair, and presenting a strong cingulum.
Its discovery was the first indication of Lemurs in the Miocene of the
United States. M. ROBUSTUM, Marsh, was as large as a Coati; and M.
LEMURINUM (Cope) about the size of a domestic Cat.