PELYCODUS. 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 capudnus) 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. ROBUSTUM, Marsh, was as large as 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). 

 Tomitherium, Cope, Rep. U. S. Geol. Surv. W. of 100 mer., 



- ii., p. 135 (in part). 

 Lemuravus, Marsh, Amer. Journ. Sci., 1875, i., p. 239. 



