338 MR. G. R. WATERHOUSE ON THE GENUS GALEOPITHECUS, 
descending ramus is large, approaches to a quadrate form, but the angles are rounded. 
The lower posterior angle is directed outwards. 
I Lin, 
Length of skull 112 
Widthig Scisaars 0 
Vertical diameter of orbit . 
Length of palate. . . . . 
Width of ditto between canines 
Width of posterior nares. 1 eee ee 
Longitudinal extent of grinding surface of the five 
SCOrON WS 
— 
S 
e- 
posterior molares, upper jaw Ours 
Width of penultimate molar Or ag2 
Length of ramus of lower jaw . 2 2 
Depth of ditto beneath canine. 0} 4-32 
Height of ascending ramus . 0 114 
The dentition, as it appears to me, is as follows: incisors, =; canines, [—?; false 
molares, 5—; ; true molares, s-*: = 34. 
The anterior incisor on each side of the upper jaw is placed remote from the apex of 
the intermaxillary bone, of a small size and compressed form, suddenly dilated above 
its insertion in the jaw, serrated at the edge, and presenting three or four nearly equal 
denticulations. The second incisor on either side resembles the first false molar in 
form, and, like that, has two fangs. The first false molar is compressed, of a triangular 
form, and has the anterior and posterior edges serrated. The second false molar is less 
compressed than the first, and is divided by a transverse indentation into two nearly 
equal, acutely pointed, triangular cusps ; the apex of the posterior cusp is directed in- 
wards. The grinding surface of each of the true molares presents a triangular figure, 
and consists of three pointed cusps, two external and one internal: on the posterior 
part, and at the base of the inner cusp, there is a small pointed tubercle ; and on the 
opposite side of the same cusp there is a corresponding tubercle of still smaller size. 
The molares of the lower jaw resemble those of the upper, excepting that the position 
of the three principal cusps is reversed, these being parallel to the inner side of the 
ramus, and the other cusp is on the outer side of these. The false molares are com- 
pressed ; the anterior one resembles its opponent of the upper jaw; the posterior one 
differs from the last mentioned, chiefly in having the hinder portion broader, and sepa- 
rated from the anterior portion by an indentation. The small lobe thus separated has 
an outer and an inner pointed tubercle. The tooth which I imagine represents the ca- 
nine is comparatively small, compressed, and considerably expanded at the apex, where 
it is serrated, having five or six denticulations. The incisors are almost horizontal in 
