1902.] 



Osborn, American Eocene Pritnates. 



187 



Fig. 12. Hyopsodus ? vicarius. Am. Mus. No. 1730. 

 Slightly less than twice natural size. 



the smallest representative of the genus in this geological 

 stage. 



(Sp. 32) Hyopsodus vicarius Cope. — The type of this species 

 (Amer. Mus. 5003) 

 is a single worn 

 molar tooth, very- 

 uncharacteristic. 

 We have provi- 

 sionally associated 

 with it a finely pre- 

 served jaw, Am. 

 Mus. Coll., No. 

 1730, Fig. 12. 



(Sp. 36) Hyop- 

 sodus (Lemuravus) 

 distans Marsh. — A 



small animal; inferior true molars =12.5 mm. In separating 

 this genus Marsh mistakenly supposed that the true Hyopsodus 



had but two superior in- 

 cisors. The coossilication 

 of the symphysis is pos- 

 sibly a valid specific dis- 

 tinction of H. distans from 

 H. paulus in which the 

 jaws are usually found 

 with the symphyses im- 

 perfect ; the symphysis 

 is lacking in the H. 

 paulus type but coossified 

 in the skull described 

 above, so that the present 

 character of this species 

 is entirely a matter of 

 conjecture. 



Fig. 13. Hyopsodus tiiarshi. Am. ]\Ius. No. 

 1706a. Slightly less than twice natural size. 

 Dental series too convergent in figure. 



(Sp. 56) Hyopsodus marshi, sp. nov. 



Among the Bridger specimens in the American Museum 

 is a pair of upper jaws (No. 1706 a) with a very perfectly 



