1864.] | DR. J. E. GRAY ON THE GENUS DERMATEMYS. 125 
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. Caromys. (Figs. 4 & 6.) 
5. GEoRYCHUS C&/CUTIENS, Gray, Cat. Mam. B.M. 149. (Teeth, 
fig. 4.) 
Bathyergus cecutiens, Licht. 
? B. hotentottus, Lesson. 
? B. ludwigii, A. Smith. 
Fur short, close, uniform grey-brown ; the perforation on the side 
of the nose in the front of the orbit large, oblong, erect. 
Hab. Natal. 
6. GroRyYcHUS DAMARENSIS, Gray, Cat. Mamm. B. M. 149. 
(Teeth, fig. 5.) 
Bathyergus damarensis, Ogilby, P. Z. 8. 
Fur short, uniform grey-brown, with a large white spot on the 
back of the head. 
Hab. Damara-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 
part of the teeth) in the Museum resembles the skull of the preceding 
in most particulars, but is rather larger in size, and the perforatian 
in the side of the nose, at the front edge of the orbit, is smaller and 
not so oblong, being only a little higher than wide. 
8. AppiTIoNAL Oxgservations oN DeRMATEMYs, A GENUS OF 
Emypip# From CenTrRAL America. By Dr. J. E. Gray, 
F.R.S., erc. 
In the ‘ Proceedings of the Zoological Society’ for 1847, p. 53, I 
described a new genus of Emydide, under the name of Dermatemys 
mawii; and in the ‘Catalogue of Shield Reptiles in the British 
Museum’ I figured the shell of the animal in detail. 
This genus was only established on a single shell, without any 
part of the animal attached to it, which was then in the Museum of 
this Society, having been presented by Lieut. Mawe, R.N. This 
specimen has since been transferred to the collection of the British 
Museum. 
Some doubts have been expressed as to the position of the genus 
in the family Emydide; and one naturalist has even gone so far as 
to doubt the propriety of establishing a genus from the examination 
of the single specimen, which he was inclined to believe was only an 
abnormal form of a typical Hmys. This I could not admit; for, 
even if it were an accidental monstrosity, we did not know an Emys 
to which it could be referred. 
