124 DR. J. E. GRAY ON THE GENUS GEoRYCHUS. [Mar. 8, 
fold on the inner side, but scarcely so on the outer; but then they 
are much worn. The expansion on the hinder part of the lower jaw 
is nearly of the same form as that of G. capensis. 
Dr. Peters, in his ‘ Nat. Reise nach Mossambique,’ t. 35. f. 3, gives 
a figure of the top of what he believes to be a young specimen of 
Bathyergus cecutiens. It is something like the skull of this spe- 
cies; but it may be the skull of the species to which Dr. Peters 
refers it, for unfortunately the teeth, which would determine the 
question, are not figured. 
B. Grinders =: Crown of the front upper small, oblong, trans- 
verse, simple; of second, third, and fourth subtrigonal, with a 
distinct fold or groove on the broader inner side ; the second 
tooth the smallest: the first lower oblong, small; the second 
square; the third trigonal; the hinder side the smallest, with 
a subtrifoliate crown. The hinder wing of the lower jaw broad, 
nearly as high as wide, with a strongly arched outline below. 
HexiopnHosivs, Peters. (Figs. 2 & 7.) 
3. Grorycuus PALLIDUS. (Teeth, fig. 2; jaw, fig. 7.) 
Rufous grey ; side of face, chin, and beneath paler yellow-grey. 
Hab. E. Africa (Capt. Speke). 
I have very little doubt that this is the animal figured by Dr. 
Peters (Reise nach Mossambique, t. 31) under the name Bathyergus 
argenteo-cinereus, and of which the skull is the skull figured as 
Heliophobius argenteo-cinereus (t. 35. f. 2), and described under the 
latter name in the ‘Bericht,’ 1846, p. 159; but he specially de- 
scribes it as having six grinders in each jaw, where we have only 
four. I think that must have been an anomaly in his specimen; 
indeed the figure does not show six well-formed teeth. 
Dr. Peters describes, and his figure represents, the fur as of a uni- 
form colour. Our specimen is paler on the cheeks and underpart of 
the body. 
C. Grinders =, all nearly similar and of nearly equal size, the 
hinder being only slightly the smallest. The crown of the upper 
ones is oblong, rounded, and with a central fold on the outer 
side. The crown of the lower with a fold in the middle of each 
side, the outer fold of the last one being almost, if not quite, 
obsolete on the outer side. The wing of the hinder part of the 
lower jaw longer than high, with a nearly straight lower edge. 
Crypromys. (Figs. 3 & 6.) 
4. GeoRYCHUS HOLOSERICEUS, Wagner. 
Hab. S. Africa. 
D. Grinders =. The upper grinders oblong, transverse, wider 
than long, the front the largest ; the hinder very small, nearly 
