' .._i^ i -'- -llJ.l-i^ 1, 



3* Sfcraqio 



and to the same scale of magnitude; B-G, various artificial or imaginary 

 types, reconstructed as intermediate stages between A and H; M, skull of 

 Mesohippus, from the Oligocene, after Scott, for comparison with C ; P, skull 

 of Protohippus, from the Miocene, after Cope, for comparison with E; Pp, 

 lower jaw of Protohippus placidus (after Matthew and Gidley), for comparison 

 with F ; Mi, MioJiippus (after Osborn), Pa, Parahippus (after Peterson), 

 shewing resemblance, but less perfect agreement, with C and D. 



