82 NATURAL HISTORY ESSAYS 



Derby established at Knowsley Hall from 1835 

 to 185 1 contained several dama which had been 

 brought home by the collector Whitfield, and in 

 1865 a pair were sent to London from the 

 Antwerp Zoological Gardens. In spite, however, 

 of the casual acquisition of a few specimens, the 

 dama is as rare as the mhorr in menageries and 

 museums, and even less if possible seems to be 

 known about it. 



The red-necked gazelle [G. ruficollis) is a very 

 pale form, being nearly all white save for the 

 rufous of the neck and anterior back ; the 

 median line of the face is also tinged with rufous. 

 It however resembles its congeners not only in its 

 size and general proportions, but also in the 

 presence of brushes on the knees, while there is 

 also a white spot on the throat. It therefore 

 appears probable that as Africa becomes better 

 known, intermediate forms will be obtained con- 

 necting this gazelle with the mhorr ; indeed, even 

 in the present state of our knowledge, we see a 

 very great likeness between the two antelopes.^ 

 Althouo^h the resemblance between the red-necked 

 gazelle and the mhorr is by no means so striking 

 as that between the latter animal and the dama, 

 nevertheless it will be admitted that all three 

 gazelles approximate not only in form and size, but 



1 Judging from a photograph published in Animal Life for May, 

 1904, the male red-necked or addra gazelle in the Khartoum 

 Zoological Gardens is almost indistinguishable from G. mhorr. 



