134 THE AUSTRALIAN TREE KANGAROO, 
MEASUREMENTS. 
mm, 
Total length (tail imperfect) . : ; . 1481 
Head ; é : : : < c PDS 
Body 4 : . . : : - . 645 
Tail : ? : : : : : . 685 
Tibia : ; : ‘ : : : . | 160 
Fore arm ' : - : : 5 « ga 
Hind foot : ; : : c : ose: 
Fore foot ; : - : 5 4 - 102 
Hind limbs, without feet : A 5 . 220 
Fore limbs ba * ‘ : ‘ : 196 
Skull : : : 5 ; : ; fears 
The forward direction of the hair of the neck in these animals 
is explained by their posture when asleep in the trees; they then 
sit with their heads and fore quarters bent down between their 
hind legs. In this position the direction of the hair from all 
sides of the summit of the back enables them to endure with less 
discomfort the incessant rainfall of their habitats. 
SKULL —This is remarkable for the development of the parts 
lodging the olfactory organs. ‘The nasal processes of the maxillary, 
and the nasals themselves, are broad, and together form a large 
olfactory chamber, while the frontals are extraordinarily tumid, 
rising into a double convexity from which the profile of tne skull 
descends rapidly fore and aft. What the food of this species is 
we do not yet know, but something of a rough nature is indicated 
by the large deep and rough insertions of the muscles actuating 
the lower jaw. ‘These are bounded by parietal crests which con- 
verge to a distance of 8 mm. from each other, and then sweep 
outwards to the exoccipital ridge, whence/the depression is con- 
tinued forwards to the root of the zygoma. ‘The premolar is not 
very elongate, being equal in length to the first and half of the 
second molar; it is formed of two rather distant lobes connected 
by a ridge on the outer side of the tooth. The front incisors are 
relatively very large; the laterals small, equal, with elongate crowns 
and subtriangular faces of wear. ‘The canines are very small and 
scarcely functional. Palate, entire. 
