Geological Progress. 339 
tion of these very interesting remains, of which Mr. Gunn’s 
collection and that of the Norwich Museum contain so fine a 
series. We are glad also to note that Mr. John Taylor, of 
Norwich, is very earnestly working in this field of research, 
where little has been done in the way of geological investiga- 
tion since Mr. C. B. Rose, F.G.S., and the late Mr. Samuel 
Woodward laboured together. 
We shall not speak now of the work going on in Glasgow, 
Edinburgh, Liverpool, or Dublin, where first-rate local geolo- 
gists are “constantly turning up fresh ground and recording new 
facts for future ceneralizers to make use of, for the pages of 
the GroLocicaL MAGazinE during the past year fully testify 
to the activity and zeal of these societies. Anyone who can 
read the signs of the times can see for himself that the progress 
of Geological Science is no fiction. 
ORIGINAL ARTICLIES. 
——_+—— 
I. On A NEw Genus (MrotopHus) or MAMMAL FROM THE 
Lonpon Cray. 
By Pror. Owen, F.RS., &e. 
[Plate X.] 
I HAVE been favoured by Mr. G. E. Roberts with the inspection 
of a fossil from the London Clay of Sheppey, which indicates a 
genus of mammals distinct from Plolophus and Hyracotherium, to 
both of which it is nearly allied. It consists of so much of the 
upper jaw (Plate X., fig. 1) as includes the six sockets of the molar 
series of each side, with the intervening bony palate and the anterior 
piers of the zygomatic arches : the upper part of this portion of skull 
has been crushed and filled up with compact septarian stone. The 
last, m 3, and penultimate, m 2, molars of both sides, and the last 
right premolar, p 4, remain in their sockets. In point of size they 
differ from those teeth in Hyracotherium leporinum in about the same 
degree as do those of Hyracotherium cuniculus,* but exhibit a 
modification of generic value. Instead of having a pair of inner 
cusps corresponding with the outer pair, a single cusp, fig. 3, ¢, d, is 
largely developed, forming almost the inner half of the erinding 
surface of the crown: the inner side of the base of this cusp is 
bordered by a ‘ cingulum’ relatively broader than in Hyracotherium, 
and complicated by many small ridges, which run up to and are lost 
upon the base of the large cusp. The largest of these ridges of the 
‘cingulum’ developes a small talon, m, at the hind part of the base 
of c d, which might be regarded as a reduced homologue of the 
postero-internal cusp, d, of Hyracotherium and Pliolophus ; but 
there is no trace of ridge connecting it with the postero-external cusp 
6b. The two outer cusps, a and 6, and the outer part of the coronal 
* «Brit, Foss, Mamm..,’ p. 424, fig. 170. 
z 2 
