1902.] 



Osborn, American Eocetie Primates. 



183 



hypoconulid indicated on all the lower molars, is strongly- 

 developed as a posterior spur on m^. 



(Sp. 34) Hyopsodus (Esthonyx) ? miticulus Cope. Meas- 

 urements in the type are : three inferior molars =12 mm. ; 

 this species may include 

 the small Wasatch speci- 

 mens which Cope has 

 referred to H. vicarius 

 and H. paulus (both 

 Bridger species) in which 

 the molars vary from 

 10 mm. to 12 mm. The 

 identification of these 

 very small jaws and 



Fig. 6. Hyopsodus ? miticulus. Am. Mus. Cope, 

 No. 4128. Twice natural size. 



teeth with H. miticulus 



is provisional. The best preserved specimen (Am. Mus. 



No. 4128) shows an exceptionally reduced third superior 



molar (Fig. 6). 



(Sp. 48) Hyopsodus le- 

 moinianus Cope. — Measure- 

 ments of three inferior molars 

 estimated at 15 mm. This 

 species includes the middle- 

 sized individuals collected in 

 the Wasatch of Wyoming, 

 namely. No. 4139, which is 

 the first figured specimen or 



Fig. 7. Hyopsodus lemoinianus. Type: 

 Am. Mus. Cope, No. 4139. Left ramus, 

 internal view. Twice natural size. 



Fig. 8. Hyopsodus letnoini- 

 anus. Am. Mus. No. 4100. 

 Twice natural size. 



Fig. ^a. Hyopsodus lemoinianus. Am. Mus. No. 

 . Twice natural size. 



type, and Nos. 4140, 4138, as well as many of the specimens 

 referred by Cope to H. paulus and H. vicarius. No satis- 

 factory specific distinction can be given atjpresent. This may 

 include specimens ranging as follows: mi-m3 = i3 to 15 mm. 



