1864.) DR. J. FE. GRAY ON THE GENUS GEORYCHUS. 123 
7. NoTEs ON THE Species oF Sanp-Moues (Grorycuvs). 
By Dr. J. E. Gray, F.R.S., etc. 
Dr. Sclater having requested me to determine two Sand-Moles 
. (Georychus) brought home by Capt. Speke, I have been induced 
to re-examine all the specimens of the genus in the British Museum. 
The species may be divided into two groups according to their fur. 
Thus the fur of G. capensis, G. albifrons, and G. unicolor is very 
similar, being soft, long, and fluffy ; while the fur of G. cecutiens, 
G. damarensis, and G. holosericeus is also much alike, but differs 
from the fur of the other species in being shorter, rather more rigid, 
apparently closer. 
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The genus may be divided into four groups by the form of the 
grinders, thus :— 
A. Gr inders =— sx: Lhe crown of the upper and lower grinders nearly 
square, with a fold or groove on the inner and outer edges. 
Grorycuus. (Fig. 1.) 
1. Georycuus capensis, Gray, Cat. B.M. p. 148; see Water- 
house, Ann. N. H. viii. t. 2. f. 2. 
The perforation on the side of the skull in front of the orbit ob- 
long, subtrigonal, almost as wide as high; forehead with a slight 
wing-like expansion over the front of the orbit; the hinder wing > of 
the lower jaw longer than high, with a slightly rounded outline be- 
neath. (Fig. 6. 
Hab. Cape of Good Hope. 
_ 2. GEORYCHUS ALBIFRONS, 0. 8. 
Fur ashy grey, with a large white spot on the forehead. 
Hab. EK. Africa (Capt. Speke). 
This species is very like G. capensis, both in the colouring of the 
fur and in the form of the grinders, but is not more than one-third 
the size, and it has a large white spot on the forehead, and no white 
on the cheeks. There is the same difference in the size of the skull; 
and the teeth are more worn, showing that it is as old. The brain- 
box of the skull is much more ventricose. The teeth have a distinct 
