PKiNciPAK Lrri:i; vriHi-: on 'riii-: i:\()Li riox of the 



iioijsi: 



lS2n. MiTCHiLL. S. J.. Calal. Org. Ucin., Ni'V \()ik. pp. 7, 8. (First 

 record of fossil liorscs in America) 



ISH. ()\\i \. l(i( iiAHi>. On Ilyracotheruun Icporinum. Trans. (Icol. 

 Soc. (2), vol. vi, PI). 2():^208. (Earliest record of the four- 

 toed horse, not then recoji;nized as ancestral to the horse 

 family) 



18()(). IIkxskl, H. Ueher JI ippdn'on meditenancum. Ahhandlun^. 

 Akad. Wiss., Berlin. (Description of the three-toed hoise of 

 soutliein iMnojx', Pliocene epoch) 



18().'^. lii'TiMKVKH, L. Beitra<»;e zur Kenntniss der fossilen Pferde. Ver- 

 hand. der naturforsch. (lesellsch. Basel, vol. iii, pp. 558-696, 

 (Extinct horses of Europe, chiefly Quaternary) 



18()9. Lkidy, .losKiMi. Extinct Mammalian Fauna of Dakota and Ne- 

 braska. Journ. Acad. Nat. Sci. Phila., vol. vii. (Numerous 

 .Ajnerican species of three-toed horses described in this 

 volume) 



1873. KowALEVSKY, W. Sur Y Anchiterium aurelianefise et sur I'His- 



toire Paleontolooique des Chevaux. Mem. Acad. Imp. 

 Sci. St. Petersbourg;, (7), vol. xx, pp. 1-73. (First attempt 

 at reconstructinf^: the ancestry of the horse from fossil speci- 

 mens) 



1874. Marsh, O. C. Notice of New Equine Mammals from the Ter- 



tiary Formations. Am. Journ. of Sci. (3), vol. vii, pp. 247- 

 258. (First reconstruction of the ancestry of the horse from 

 American fossils) 



1875. BuRMEisTEK. H. Los Caballos Fosiles de la Pampa Argentina. 



Published for the Provincial Government of Buenos .Aires 

 Exhibit at the Centennial Exhibition, Philadelphia, 1876. 

 (Description and illustration of Hippidium and other ex- 

 tinct horses of South .America) 



1879. Marsh, O. C. Polydactyle Horses, Recent and Extinct. .Am. 

 Journ. Sci. (3), vol. xvii, pp. 499-505. (American ancestry 

 of the horse, with diagrams showing the evolutionary stages) 



1885. Cope, E. D. '^Hijracotherium'' {Eohippu,s), in "Tertiary Verte- 

 brata, " Report U. S. Geol. Sur. Terrs., vol. iii, book 1, 

 pp. 624-652, pU. xlixa,xlix6, xlixc. (Description and figures 

 of the skeleton of the four-toed horse) 



1887-90. Pavlow, Marie. Etudes sur I'Histoire Paleontologique des 

 Dngules. Bull. Soc. Imp. Natur., Moscow 



64 



