390 Zoological Society : — 



I have very little doubt that this is the animal figured by Dr. 

 Peters (Raise nach Mossambique, t. 31) under the name o{ Bathyer- 

 ffus argenteo-cinereus, and of which the skull is that figured as 

 Heliophobius argenteo-cinereus (t. 35. f. 2), and described under the 

 latter name in the 'Bericht,' 1846, p. lo9; 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 tipper 

 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. 

 Crvptomys. (Figs. 3 & 6.) 



4. Georychus holosericeus, Wagner. 

 Hab. S. Africa. 



D. Grinders j::^. The upper grinders oblong, transverse, wider 



than long, the front the largest ; the hinder very small, nearly 

 circular. The lower grinders oblong, much wider than long ; 

 the three front subequal ; the hinder smaller, nearly circular. 

 The posterior wing of the lower jaw longer than high, with a 

 nearly straight lower margin. C(etomys. (Figs. 4 & 6.) 



5. Georychus c^cutiens. Gray, Cat. Mam. B.M. 149. (Teeth, 

 fig. 4.) 



Bathyergus ccecutiens, Licht. 

 ? B. Hotentottus, Lesson. 

 IB. Ludwigii, A. Smith. 



Fur short, close, uniform grey-brown ; the perforation in the side 

 of the nose, in front of the orbit, large, oblong, erect. 

 Hab. Natal. 



6. Georychus damarensis. Gray, Cat. Mamm. B, M. 149. 

 (Teeth, fig. 5.) 



Bathyergus damarensis, Ogilby, P. Z. S. 



Fur short, uniform grey-brown, with a large white spot on the 

 back of the head. 



Hab. Daniara-land. 



This animal greatly resembles the preceding, but is larger, and has 

 the white spot on the back of the head. The imperfect skull (with 



