324 Game of Europe, W. & N. Asia & America 



these exostoses, and when it has come so far that it hips over them it 

 cannot he driven out anv more or he prolonged, hecause its shape hinders 



this. . . . 



"The horn is, however, not yet fully formed although its length 

 has reached its maximum. The continued growth tends to thicken the 

 horny sheath, especially its upper layers. The hony substance of which 

 the exostoses consist is reabsorbed and replaced by horny layers. It may be 

 said metaphoricallv that the horny sheath eats down into the bony mass, 

 which thus gets a rugged and pitted surface. The pits and holes are tilled 

 up with horny substance." 



In regard to the distribution of the present and preceding races 

 of the musk-ox. Dr. Allen has published the following important 

 observations : — 



" The geographical relations of the two are not clear, but it seems 

 probable that O. icarcii is the form inhabiting the numerous islands, more 

 or less joined by ice in winter, situated east and north of Belcher Channel 

 and Jones Sound, while O. moschati/s is confined mainly to the Barren 

 Grounds, with formerly, probably, continuous distribution westward across 

 Alaska. The eastern limit of O. moscJmtiis cannot at present be accurately 

 defined. The Melville Island specimens obtained by Parry on his first 

 voyage in 1820 evidently represent typically the Barren-Ground torm, as 

 shown by Parry's and Gray's figures. Whether or not 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 Repulse Bay and King William Land, but is absent from South- 

 ampton Island, and Fox Channel has apparently proved a barrier to its 

 extension to Cockburn and Baffin Lands. As O. icv/;v// 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 steuaries where 



