228 REPOR1T—1843. 
Suffolk, from which the remains of Quadrumana have been obtained*, Mr. 
Colchester, the discoverer of those remains, has subsequently found the teeth 
of small mammalian animals, some of which are referable to the genus Hy- 
racotheriumt. 
The teeth from Kyson are three true molars and one of the false molars, 
all belonging to the upper jaw. The crowns of the true molars present the 
same shortness in vertical extent, the same inequilateral, four-sided, transverse 
section, and nearly the same structure, as in Hyracotherium leporinum ; the 
grinding surface being raised into four obtuse pyramidal cusps, and sur- 
rounded by a well-developed ridge, produced at the anterior and outer angle 
of the crown into a fifth small cusp. 
These teeth are, however, of smaller size, and differ in a point not expli- 
cable on the supposition of their having belonged to a smaller individual or 
variety ; for the ridge which passes transversely from the inner to the outer 
cusp is developed midway into a small crateriform tubercle in the teeth of the 
Hyracotherium leporinum, but preserves its trenchant character in the Hyrae. 
Cuniculus, even in molars which have the larger tubercles worn down. 
The premolar in the series of detached teeth from Kyson, which is either 
the third or fourth, presents the same complication of the crown which distin- 
guishes the Hyracotherium from the Cheropotamus, but with the same minor 
modification which distinguishes the true molars of the Kyson species from 
those of the Hyrac. leporinum of Herne Bay ; 7. e. the two ridges which con- 
verge from the two outer tubercles towards the internal tubercle are not de- 
veloped midway into the small excavated tubercle, as in the Hyrae. leporinum, 
but are simple. The disparity of size between the true and false molars ap- 
pears to be greater in the Hyrac. Cuniculus than in the Hyrac. leporinum. 
This discovery of a second species of the genus Hyracotherium, which, 
hitherto, has been found only in the London clay, tends to place beyond 
doubt the equivalency of the Kyson sand, underlying the red crag, with the 
eocene deposits at the estuary of the Thames. 
I may add, that the collection of teeth and other small organic fragments 
from the Kyson clay, which included the molars of the small extinct Pachy- 
derm above described, likewise contained several vertebre of a serpent, agree- 
ing in every respect, save size, with those of the Paleophis toliapicus from 
the Isle of Sheppey. 
Genus Sus. 
When Cuvier communicated his memoir on the fossil bones of the Hog to 
the French Academy in 1809, he had met with no specimens from formations 
less recent than the mosses or turbaries and peat-bogs, and knew not that 
any had been found in the drift associated with the bones of elephants. He 
repeats this observation in the edition of the ‘Ossemens Fossiles’ in 1822; 
but in the additions to the last volume published in 1825, Cuvier cites the 
discovery, by M. Bourdet de la Nievre, of a fossil lower jaw of a Sus, on the 
east bank of the lake of Neuchatel, and a fragment of the upper jaw from the 
cavern at Sandwich, described by Goldfuss. 
Dr. Buckland ¢ includes the molar teeth and a large tusk of a boar found 
in the cave of Hutton in the Mendip Hills, with the true fossils of that re- 
ceptacle, as the remains of the Mammoth, Spelzan Bear, &c. With respect 
to cave-bones, however, it is sometimes difficult to produce conviction as 
to the contemporaneity of extinct and recent species. MM. Croizet and 
Jobert, in their account of the fossils of Auvergne, give more satisfactory 
evidence of the coexistence of the genus Sus with Elephas, Mastodon, &c., 
by describing and figuring well-marked fossils of a species of Hog, which 
* See Report of British Association for 1843. 
+ Geological Transactions, 2nd Series, vol. vi. p. 203. t Relig. Diluviane, p. 59. 
