252 THE OX AND ITS KINDRED 
naturalists, to separate generic groups — the European 
ox to Bos, the gayal and probably humped cattle to 
Bibos, the yak to Pocphagus, and the bison to Bison. 
On the other hand, there is more justification for as- 
signing generic rank to the buffaloes {Bubalus), which, 
as we have seen, are not known to breed with any of 
the other species. In the Fauna of British India — 
Mavimalia, Dn W. T. Blanford included the whole 
of the members of the cattle in the typical genus 
Bos ; and this plan has been followed by myself in 
Wild Oxen, Sheep, and Goats, and it has also been 
adopted by Mr. R. I. Pocock,^ as it likewise is in the 
present volume. That it best represents the relation- 
ship of the various species I am fully convinced ; 
although, as stated above, there are certain grounds 
for generically separating the buffaloes from the rest. 
Since writing the above I find that a hybrid be- 
tween a Chillingham bull and a female yak has 
recently been bred in the Royal Dublin Zoological 
Gardens. 
^ Proc. Zool. Soc. London^ 1910, pp. 933, 934. 
