RUFOUS RAT-KANGAROO. 
199 
openings, which nre generally so large ; here the palatine 
bone is of a square form, and the polato-maxillary suture 
crosses opposite the interspace of the second and third true 
molar tooth ; at the anterior angles of the pulatine bone is a 
minute perforation. The skull, moreover, is remarkable for 
its breadth, and for the shortness of the facial portion, niul 
consequently of the nasal bones, and of the interspace 
between the premolar tooth and the incisors. The palatal 
interspace between the hinder pair of incisors is much con¬ 
tracted, being not more than three-quarters of a line in 
width, and this contraction is owing to the comparative great 
transverse diameter of the teeth in question. The palate is 
broad and concave ; the zygomatic arch comparatively deep, 
measuring towards the hinder part about four lines from the 
upper to the lower edge. 
Although the skull has not been removed from the skin of 
the specimen of H ypsiprymnux rufesccns in the Zoological 
Society’s museum, I have been enabled to make one or two 
admeasurements of the foremost teeth, and of the distances 
between them; and these I have added in the second column. 
—the first giving the dimensions of an imperfect cranium con¬ 
tained in the Royal College of Surgeons’ museum.— See 
Plate 10, fig. 1. 
Inches. Lines. 
Length from the posterior root of the zygo¬ 
matic arch to the apex of the inter¬ 
maxillary bones . 2 7 K 
** of the zygomatic arch . 1 6 
Width of skull.. 1 11 
Length of nasal bones . I 2 
Width of ditto at the base ... .. ..0 74 
M ** near the ajK;x ... ... 0 4 
Length of the three incisors of upper jaw, 
taken together 0 4£ 
** from posterior incisor to canine ... 0 1£ 
u from canine to premolar 0 1$ 
“ of premolar ^the milk tooth) ... 0 
Inches. Lines. 
0 
0 
0 
4 
4 
o 
