104 Proceedings of the Association 
gin, except at the expansion of the valley. The third molar is 
similar to the others, but larger and sinuate on the sides, the pos- 
terior part is rounded, and the basal ridge posteriorly rises into a 
small acute cusp, connected with the internal -_— Fic. 2 
The anterior and posterior faces have an obsolete ba- 
sal margin connected with the transvere ridges by 
a slight elevation, running obliquely outwards. The 
last molar is elongate, narrowed and rounded posteri- 
orly with two transverse ridges as in the second molar ; 
it has a very obsolete anterior basal margin, and a large 
posterior undivided talon, as much elevated as the two ridges: 
this talon is separated by a valley quite siesta to the valle} 
which separates the two principal ri 
The humerus of this animal is perforated at its distal extrem- 
ity by a large round foramen: this bone, the cubit, vertebrae, &c. 
will be more fully described in a paper illustrated by figures, 
which the author is now preparing for publication by one of our 
learned societies. In this paper also the affinities of this and the 
other proposed genera will be pointed out in detail. 
The second animal belongs to the Suiline group and ‘was de- 
ponies as a Dicotyles; the author beiug now convinced of its ge- 
eric difference, proposes the name Hyops depressifrons. It is 
distinguished from Dicotyles, by the very depressed ee the 
nasal bones being very slightly curved transversely in the are of 
a circle, while in Dicotyles the sides are nearly perpenditi 
The part of the os frontis between the frontal grooves is less e 
vated than the part adjoining the orbit; in Dicotyles they form 
nearly one plane; the frontal foramen 1 is placed half an inch 
hind the transverse line joining the anterior margins of the orbits; 
in D. torquatus the foramina are situated on this line; the malar 
bones are very broad and directed downwards, instead of being 
nearly perpendicular as in D. torquatus. The orbit of the eye 
is deeper, larger and directed upwards and outwards. Behind 
the frontal foramina on each side is a large round shallow im- 
pression: the suture between the nasal and maxillary bones crosses 
the prolongation of the frontal groove, which remains superior, 
while in D. torquatus it becomes lateral. ‘The canine of the 
er jaw is very similar in form and size to that of D. torquatus, 
from which it differs in having the anterior margin much less 
— while the lateral grooves, (rudimentary i in D. eg 
Inner view. 
sai some other bones of the foot, resemble cna the corres- 
bones of Sus scrofa; they will be described and figured 
