PAI^EOTHERIID^S. EQTJID^. 49 



Anchitherium bairdi (Leidy 1 ). 



Syn. Palaotherium bairdi, Leidy 2 . 

 Mesohijypus bairdi, Marsh 3 . 



This is a small species, referred to Anchitherium by Leidy in the 

 ' Ancient Fauna of Nebraska,' p. 67 (Smithsonian Contributions, 

 vol. vi. [1853]) ; and made by Marsh the type of the genus Meso- 

 hippus. The lateral digits are relatively larger than in the last 

 species ; the fifth metacarpal is represented by a splint, and the 

 meso- and ectocuneiform are separate. 



Hob. N. America. 



40957. Cast of the skull. The original is from the Miocene of 

 Dakota, U.S.A., and is described and figured by Leidy in 

 the Journ. Ac. Nat. Sci. Philad. ser. 2, vol. vii. p. 303, 

 pi. xx. (1869). Purchased, 1868. 



29685. Fragment of a right maxilla, with the three true molars ; 

 from Dakota. This specimen is figured in the accompany- 

 ing woodcut (fig. 10). purchased, 1855. 



Fig. 10. 



Anchitherium bairdi. The right upper true molars ; from the 

 Miocene of Dakota. }. 



29684. Fragment of the left ramus of the mandible, with two 

 cheek-teeth ; from Dakota. Purchased, 1855. 



Family EQUID^E. 



The division between this and the preceding family is but an arbi- 

 trary one, and Hipparion, owing to the usual presence of three 

 digits, is classed by Cope and Flower in the latter. The apparently 



1 Proc. Ac. Nat. Sci. Philad. vol. v. p. 122 (1851 ; vol. dated 1862); Palceo- 

 therium. 



2 Loc. tit. 



9 Amer. Journ. ser. 3, vol. ix. p. 248 (1875). 



PABT III. E 



