I 36 MUFFLE OF DENDROLAGUS CHAP. 
the latter. Dorcopsis is confined to New Guinea, and contains 
three species, viz. D. muellert, D. luctuosa, and D. macleani. 
D. mueller has a striking resemblance to Macropus brunii, with 
which it has been confounded. Though intermediate between 
Macropus and Dendrolagus, these Kangaroos are not arboreal. 
The genus Dendrolagus is remarkable for its un-kangaroo-like 
habit of living in trees. In accordance with this change of 
habit is a relative shortening of the hind-limbs, a feature which 
Fic. 67.—Tree-Kangaroo. Dendrolagus bennetti. ~x zis. 
begins to be observable in Dorcopsis. “The general build,” writes 
Mr. Thomas, “is of the ordinary mammalian proportions, not 
macropodiform at all.” The muffle is not naked for the greater 
part, though the shortness of the hairs gives that effect. As in 
Dorcopsis, but not as in Macropus, the bulla tympani is not 
swollen. There are altogether five species, the fifth, D. bennetti, 
having been lately described from specimens living in the Zoo- 
logical Society’s Gardens. 
The anatomy of this genus has been described by Owen for 
D. inustus,’ and by myself for D. bennetti. The stomach, which 
1 Proc. Zool. Soc. 1852, p. 103. 
