258 
THE MAMMALS OE EGYPT. 
Dr. Anderson has the following note on this specimen :— 
“ Gerbillus burtoni, F. Cuv. Type. Mort k la menagerie le 22 Fev., 1838, male, Gerbille du 
Sennaar, M, Burton. 
“ This specimen has lost one half of its tail. 
mm. 
Measured along curve of back.130 
Tarsus.30 
Ear.14 
“ The skull measures as follows :— 
mm. 
Foramen magnum to tip of premaxillaries.39 
„ ,, posterior end of palate.10'5 
Length of snout from end of nasals to lachrymal notch.12 
Breadth above zygoma. 14 
Length of dental row, upper. 4 5 
,, osseous palate from behind incisors.15 3 
“ I am inclined to regard this as an example of the large form of Gerbillus found 
at the Pyramids.” 
In the Berlin Museum there is a specimen collected by Hemprich and Ehrenberg 
in Upper Egypt, which has been identified by Sundevall as his Meriones vemistus. 
Of this specimen Dr, Anderson says:—“ Seems to agree in every way with those found 
at the Pyramids; snout to vent 88 mm., vent to tip of tail 113, height of ear 11, 
breadth of ear 6-5, length of tarsus 27.” Dr. Anderson did not then realize the 
distinction between G. pyramidum and G. pygargus, so we may conclude that this 
specimen belongs to the latter form, as also, in all probability, does the true 
G. venustuj, Sund., from Sennaar. 
A note written by Dr. Anderson at a later date is as follows:—“ In the British 
Museum there is one of Buppell’s original examples of Meriones gerbillus [nec Bipus 
gerbillus, Olivier], and therefore a co-type of G. pygargus, F. Cuv., which was founded 
on that form. It was captured in Nubia. In external character it resembles the small 
bright-coloured gerbil of the Pyramids in that the fur has no black tips to the hairs, 
and the ear is white. The skull has been removed from the skin, and the state of the 
teeth shows that the animal was comparatively young. The teeth are much larger 
than those of G. gerbillus, and we have Cretzschmar’s measurements to show that 
this Nubian form is a much larger species than G. gerbillus. In size this specimen 
resembles G. pyramidum, but the character of its fur is entirely different, since the 
fur of G. pyramidum is invariably tipped with black, which gives a generally varie¬ 
gated or speckled appearance to the upper surface. .Until further materials bearing on 
