GENUS IIY I’S I TRY M N US. 
193 
regard to the upper incisor teeth, the differential characters 
are, that they are proportionately smaller, less compressed 
from the outer to the inner side; the foremost pair descend 
much below the lovol of the other two pairs, and these latter 
pairs are not so widely separated from each other as in 
Macropus, owing to the contraction of the palate between 
them. The canine teeth are always present, and usually 
pretty well developed; they are very small, however, in 
in front, and above all it differs in its great strength, the bones being thicker in 
proportion than in any of the species of Macropodidrc I hare met with: the 
temporal ridges meet, and form a distinct sagittal crest: the palate is remark¬ 
able for presenting four posterior palatine openings, two of which are nearly 
round, and situated entirely in the palatine bones, and are rather more than 
4 lines in diameter; the other pair arc oblong, of about the same size, and 
are placed at some little distance in advance of the palato-maxillary suture. 
The canine tooth is more developed than usual, and in this character, as well 
as in having the auditory bullae prominent, the L. cotupicillatus approaches 
Hyptipryvmvi ; the premolar is moreover large for a Macropus, though 
smaller than in HypHprynmus, The foremost upper pair of incisor teeth are 
very much larger than the other two pairs; the palate, however, is not con¬ 
tracted between the lateral pairs of incisors, as in Hypsiprymnus: and the 
itructure of the true molar teeth, the great depth of the zygomatic arch, the 
small size of the frontal bones (which are considerably contracted between the 
orbits), combined with the structure of the fore feet in the animal, all tend to 
show that its more direct affinity is with Macropus, The dimensions of this 
skull are as follows :— 
Adult Malk. 
Inches. 
Lines. 
Total length of skuU . 
3 
4 
Width . 
2 
H 
11 between orbits . 
7* 
Length of nasal bones. 
l 
4 
Width of ditto behind . 
7i 
41 44 near the apex . 
4} 
Depth of zygomatic arch behind . 
54 
Length of the three upper incisors, taken 
together . 
4 
Distance between posterior incisors and 
prcmolar ... .. . 
5 
Length of the five molar teeth, taken 
together .. 
1 
4 
VOL. I. 
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