1901.] Allen, Musk-Oxen of Arctic America and Greenland. 77 



Fig. 6. Forefoot of Ovibos wardi^ 

 z natural size. 



it crosses eastward to the adjoining islands there is apparently 

 no certain evidence, but much of a negative character indicating 

 its absence. It can easily 

 reach Melville Island 

 from Banks Land. It has 

 been found in numbers in 

 the region between Re- 

 pulse Bay and King Wil- 

 liam Land, but is absent 

 from Southampton Is- 

 land, and Fox Channel 

 has apparently proved a 

 barrier to its extension to 

 Cockburn and Baffin 

 Lands. As O. wardi has 

 not been traced south of 

 Ellesmere Land, nor west 

 of Ellesmere Land and 



Grinnell Land, there is apparently a broad interval of insular areas 

 and estuaries where no form of Musk-Ox at present exists, leaving 

 the ranges of the 

 two forms well sepa- 

 rated. When Musk- 

 Oxen ranged far to 

 the southward of 

 their present limits, 

 they doubtless had a 

 continuous distribu- 

 tion over a large part 

 of northern North 

 America, and have 

 become differentiat- 

 ed in comparatively 

 recent times through 

 separation in their 

 gradual retreat 

 northward. 



The known range of O. wardi extends from the southern 

 border of Ellesmere Land northward through Grinnell Land to 



Fig. 7. Forefoot of Ovibos moschatus, Y Z natural size. 



