THE FOSSIL BISON OF NORTH AMERICA— LUCAS. 



767 



ference at base, slightly flattened above; transverse diameter slightly 

 exceeding vertical; curve of horn core regular, but slight. 



This species is based on an imperfect horn core, which indicates a 

 species more nearly like B. latifrons in the shape of the horn cores than 

 any other species, although little can be said save that the fragment in- 

 dicates a robust horn core with comparatively little curve. The speci- 

 men is but little furrowed; less so than any other specimen examined. 



It dift'ers from 7>. crassicornis in having rounder and more massive 

 horn cores, besides, as was said in the introduction, B. crassicornis has 

 not as yet been found outside of Alaska. 



Measurements of horn core of Bison ferox. 



' Estimated, the specimen being imperfect. 



BISON LATIFRONS (Harlan). 

 (Plate LXXXII.) 



Aurochs CuviER, Ann. dii Mus., 1808, p. 382, pi. xx.xiv, fig. 2. 



Aurochs CuviER, Oss. Foss., IV, 1812, p. .50, pi. iii, fig. 2. 



Bos latifrons Harl.\n, Fauna Americana, 1825, p. 273. 



Bisoti latifrons Leidy, Proc. Acad. Nat. Sci., Phila., 1852, p. 117. 



Bison latifrons Leidy, Mem. Ext. Sp. Am. Ox., 1852, p. 8, pis. i. ii (Smithsonian 



Contributions). 

 Bos arizonica Blake, Am. Geologist, August, 1898, p. 65. 

 Bos latifrons Lydekker, Wild Oxen, Sheep and Goats of all Lands, London, 1898, 



p. 92. 



Type. — In the Academy of Natural Sciences, Philadelphia, from Big 

 Bone Lick, Kentucky. Horn cores very long, the distance along the 

 upper curve very greatly exceeding the circumference at the base, 

 regularly and slightly curved, subcircular in section, the transverse 

 but slightly exceeding the vertical diameter; tips not abruptly recurved 

 nor directed backward. 



This is the largest species of American bison, the horn cores attain- 

 ing a spread of 6 feet from tip to tip and the height at the shoulder, 

 as indicated by a metacarpal, being upward of 6 feet, or from 6 to 9 

 inches greater than in the largest examples of B. hison. 



The horn cores are directed somewhat backward, as in B. crassi- 

 cornis, but they do not have the very decided downward dip which 

 characterizes adults of that species. 



The U. S. National Museum possesses an imperfect skull of this si>e- 

 cies from the Withlacoochee River, Florida, and a metacarpal and three 

 teeth from the Peace Creek phosphate deposits are also ascribable to 

 B. latifrons. The metacarpal is distinguished by its size, and particu- 



