CREODONTA. 251 



Diameter8ofcrownofcanine^^t«™P°''*«"<'' ^^^ 



i vertical 0018 



Diameters crown of Pm. hi 5 anteropoeterior 0020 



( transverse 0026 



Diameters crown of Pm. iv 5 anteroposterior 0020 



( transverse 0035 



Diameters M. ii 5 ''"t'="''''"'«terior 0032 



' transverse 0040 



Diameters M.iii^^"t«''°I"*»*''"°'^ ^^^ 



( transverse 0028 



Diameters of orbit ,<™'*'™P°«*®""'" "l^" 



< vertical (f depressed) 0078 



Interorbital width (least) 0050 



The AnaptomorpJms homunculus was nocturnal in its habits, and its food 

 was like that of the smaller lemurs of Madagascar and the Malaysian 

 islands. Its size is a little less than that of the Tarsius spectrum. The 

 typical specimen was found by Mr. J. L. Wortman in a calcareous nodule 

 in the Wasatch formation of the Big Horn Basin, Wyoming Territoiy. 



As compared with the A. cemulus it is smaller in the dimensions of its 

 teeth. 



CREODONTA. 



Cope, Proceed. Acad. Phila., Dec. 1875. Report Capt. \Vheeler Expl. Surv. W. of 100th Mer., iv, pt. ii, 



pp. 72 and 87. 



Unguiculate (?) placental Mammalia, with separate scaphoid and lunar 

 bones; narrow cerebral hemispheres, and very large and exposed olfactory 

 lobes; and the ankle-joint generally not trochlear. 



The above definition was derived from the flesh-eaters of the Suesso- 

 nian formation of New Mexico and France. The characters of the brain 

 have been demonstrated in three genera: in Arctocyon by Gervais; Oxycena 

 by Cope, and Stypolophus by Filhol. The peculiar ankle-joint was shown to 

 be present in four genera, Amblydonus, Oxycena, Stypolophus, Didymictis, and 

 Heteroborus. The uniform absence of the characteristic cai'pal bone of the 

 Carnivora, the scapho-lunar, gave ground for inferring its division into its 

 primitive pieces in the same genera; and the view was supported by the 

 existence of this division in the Bridger genus Mesonyx. 



How far these characters are common to the flesh-eaters of the Bridger 

 formation is yet uncertain. The genus Mesonyx differs widely in its ankle- 

 joint, but its dentition is so near that of Amhlyctonus that they probably 



