Wortman — Studies of Eocene Mammalia. 



203 



Art. XYIII. — Studies of Eocene Mammalia in the Marsh 

 Collection, Peabody Mtiseum ; by J. L. Wortman. 



[Continued from vol. xvii, p. 140.] 



On the Affinities of the Omomyince. 



As I have already fully stated, my arrangement of this group 

 of Primates under the Paleopithecine division of the Anthro- 

 poidea is only provisional. The incompleteness and frag- 



135 



136 



Figure 135. — Lower jaw of Tarsius spectrum ; crown view ; two and one- 

 half times natural size. 



Figure 136. — Upper teeth of Tarsius spectrum ; crown view ; two and 

 one-half times natural size. 



mentary condition of the remains of all the species thus far 

 known precludes the possibility of determining their affinities 

 and position with any great degree of exactness. It has been 

 pointed out that the dentition of the lower jaw, and presumably 

 that of the upper jaw also, in all the species in which it is 

 definitely known, is represented by two incisors, a canine, three 

 premolars, and three molars. This number differs from that 

 of Tarsius, figure 135, in the presence of an additional incisor, 

 there being only a single pair in the lower jaw of that genus. 

 The structure of the lower molars and premolars accords well, 

 moreover, with that of Tarsius, which undoubtedly represents 

 a very generalized pattern among the Primates, and one from 

 which it is possible to derive all the more complex types of 

 the higher forms. In the structure of the superior molars, all 

 the species of the Omomyinse have apparently advanced beyond 



