PELYCODUS. E25 
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. 
GENUS MENOTHERIUM. 
Menotherium, Cope, Bull. U. S. Geol. Surv. Territ., 1874, i., 
p. 22. 
Laopithecus, Marsh, Am. Journ. Sci., 1875, i., p. 240. 
This genus was established on an under jaw from the Lower 
Miocene White-river beds of Nebraska. Its molars are suc 
cessively 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. RospusTum, Marsh, was as largeas a Coati; 
and M. LEMURINUM (Cope) about the size of a domestic Cat. 
GENUS PELYCODUS. 
Pelycodus, Cope, Cat. Verteb. Eoc. New Mex., p. 13 (1875). 
Tomuthertum, Cope, Rep. U.S. Geol. Surv. W. of roo° mer., 
i.,.p. 135 (in part), 
Lemuravus, Marsh, Amer. Journ. Sci., 1875, 1., p. 239, 
