1 62 THE OX AND ITS KINDRED 
istic of the Bornu cattle ; and it is probable that the 
originals of the two casts were brought from the 
same country to one of the Spanish settlements in 
north-western Africa. The smaller of the two, 
which has a very small terminal portion, apparently 
agrees very closely with a single horn represented in 
fig. I of the above-quoted plate in vol. iv. of The 
Aniinal Kingdom, under the name of Catoblepas brookii^ 
Hamilton Smith, of which it is the type ; and I have 
therefore little doubt that this so-called Brook's gnu 
is founded on the horn of a Bornu ox. If worn down 
by age, a horn of the type of the smaller Madrid 
specimen and of that of the so-called Catoblepas 
brookii would have much the appearance, externally, 
of a well-worn horn of the great Indian rhinoceros 
[Rhinoceros unicornis') ; and in January of the present 
year Dr. M. Braun, of the Royal Zoological Museum 
at Konigsberg, wrote to me about a horn in that 
collection which I believe to be a much worn one of 
the Bornu ox. The specimen has the form of a 
blunt cone, with the summit distinctly recurved ; 
and, to use Dr. Braun's own words, looks externally 
like the worn horn of an Indian rhinoceros. It has 
a basal diameter of just over 8 inches, and a height 
of close on lo inches — dimensions which would not 
be very different from those of the smaller Madrid 
specimen if the slender terminal portion were worn 
away by use. 
The tribes of north-eastern Abyssinia, such as 
the Gadabursi and Eissa-Somali, own a breed of 
long-horned cattle stated to be very similar in general 
appearance and characters to the under-mentioned 
Damara cattle. 
