e 



MESODONTA. 233 



SARCOLEMUR Cope. 



Proceed. Acad. Nat. Sci. Phila., 1875, p. 256. 



Molars 4-3, the last with heel; crowns of true molars of four oppo- 

 site or slightly alternating tubercles, the external pair slightly crescentic in 

 section ; anterior inner tubercle bifid. The premolars are compressed, the 

 last acute and with an acute inner tubercle. This form differs from its 

 nearest ally, Pelycodus, in the development of acute cusps on the heels of 

 the true molar teeth. The same character distinguishes it from the other 

 genera here enumerated, excepting Hyopsodus. But this genus has the 

 anterior inner tubercles simple. The type is S. pi/gmceus Cope (Antiacodon 

 furcalus Cope, Annual Report U. S. Geol. Surv. Terrs., 1872, p. 608); 

 another species is the S. mentalis Cope (Systematic Catal. Vert. New Mexico, 

 1875, p. 17). S. crassus, he. cit., belongs to some other genus, Mesodont or 

 Creodont. 



Saroolemur pygm^us Cope. 



Proceed. Acad. Phila., 1875, p. 256; Lophiotherium pygmcBum Cope, Proceed. Amer. Philos. Soc, 1872, 

 extras July 29; Syopsodua pygmceus Cope, loc, cit., p. 461; Antiacodon fiircatus Cope, Ou some 

 Eocene Mammals, etc., p. 1, March 8, 1873. Annual Report U. S. Geol. Surv. Terrs., 1872, p. 608, 

 1873; Saroolemur furcatus Cope, Proc. Phila. Acad., 1875, p. 256. 



Plate XXrV, figs. 18-19. 



Represented by a portion of the right mandibular ramus, with the 

 penultimate and antepenultimate molars in perfect preservation. These 

 teeth present four cusps, of which the outer are crescentoid in section, the 

 inner conic. They are all elevated, and the inner anterior is in both teeth 

 compressed and bifid. It receives an oblique ridge from the outer posterior 

 crescent, which also sends a ridge to the posterior inner. Enamel smooth. 



Measurements. 



M. 

 Length of penultimate molar 0045 



Width of penultimate molar behind 0040 



Depth of ramus at posterior margin of penultimate molar ^ 0070 



The typical specimen of the S. pygmoeus is a part of the right ramus 

 mandibuli, with the three molars and last premolar in perfect preservation. 

 The crowns of the molars are composed of two external chevron-shaped 

 tubercles, the apices rising as acute cusps, and two internal cones, the 



