140 Bulletin American Museum of Natural History. [Vol. XIV, 



size of the largest western pony, but with a longer body, a 

 much larger head, a shorter neck, and a back and steeply 

 sloping sides shaped very much as in the ass or quagga. 

 E. GiGANTEUS. — Southwestern Texas. The largest species of 

 horse hitherto recorded, the teeth exceeding those of the 

 largest modern draught horses by more than one-third the 

 diameter of the latter. 



Pliocene species wrongly referred to Equus. 



E. simplicidens = Pliohippus sp. ? 

 E. eurystyhis = Hipparion sp. ? 

 E. cumminsii — Protohippus sp. ? 

 E. minutus = Protohippus sp. ? 

 E. phlegon = Protohippus sp. ? 



There are a number of teeth in the Niobrara River collection 

 which seem to be intermediate between E. complicatus and E. 

 fraternus, yet they seem not to show characters sufficiently 

 definite upon which to found a new species. This, however, 

 may be done when better material from the Nebraska locality has 

 been found. 



Bibliography. 



Cope, E. D. 



'84. The Extinct Mammalia of the Valley of Mexico. 



(Palseont. Bull. No. 391, 884.) Froc. Am. Phil. Soc, Vol. 



XXII (1884), 1885, pp. 1-15. 

 '85. Pliocene Horses of Southwest Texas. Am. Naturalist^ 



Vol. XIX, 1885, p. 1208, pi. xxxvii. 

 '92. Report on Palaeontology of the Vertebrata. Third Ann. 



Rept. Geol. Surv. Texas {\%()\)., 1892, pp. 251-252. 

 '92. A Contribution to the Vertebrate Palaeontology of 



Texas. Proc. Am. Phil Soc, Vol. XXX, 1892, pp. 123-125. 

 '93. A Preliminary Report on the Vertebrate Palaeontology 



of the Llano Estacado. Fourth Ann. Rep. Geol. Surv. Texas, 



1893, pp. 1-137. 

 '95. On Some Pleistocene Mammalia from Petite Anse, La, 



Proc. Am. Phil. Soc, Vol. XXXIV,' 1895, pp. 458-468, plh 



xi and xii. 



