Implement and Bones of Extinct Kangaroo. 89 



in the shortness of the fore-limb. The humerus of the left side is 

 in evidence. Of this bone we have the head, minus the lesser 

 tuberosity, and the lower end of the shaft with a portion of the 

 outer condyle and capitellum. The length of the head and 

 greater tuberosity, 58 mm., bears about the same proportion to that 

 of the cheek-teeth, as do the corresponding parts of J/, giganteus 

 one to another. On the testimony of this dimension the bulk of 

 M. f annus might have been estimated as about two and a half 

 times that of M. giganteus. A bone in the Queensland collection, 

 so like this as to be referable to the same species, though pre- 

 viously attributed to M. t/iagisier, is 213 mm. in length, and 

 82 mm. in the breadth of its distal end. The remains of the 

 fibula appear uninstructive ; those of the foot on the contrary 

 yield information of no little value ; compared with the tibia it 

 is shorter proportionately than that of M. giganteus, and, in this 

 respect, stands intermediate between the Great Kangaroo of the 

 plains and the Wallaroo, AI. rohustus, of the mountains. Though 

 conforming to the jNIacropodine type of foot in the attenuation 

 and syndactylism of its second and third toes, and the consequent 

 slenderness of its metatarse, its free toes are usually broad, and 

 in the form of their claws present a suggestive modification. The 

 fourth ungual phalanx, in lowland kangaroos and wallabies, a 

 long trilaleral pyramid with straight edges and sharp angles, is 

 curved on both its superior and inferior profiles, even more so 

 than in Tree-climbing Kangaroos, Denarolagus, and has also near 

 its distal end a marked curve outward. The fifth ungual phalanx 

 is still more distinctly unciform ; in general shape it might be 

 compared to a hawk's upper mandible, with a rounded culmen 

 and sharp lateral edges, of which the outer is dilated at about 

 its posterior third. Sheathed with horn, this claw would ably 

 support its colleague in securing a firm foot-hold on whatever 

 surface the animal was wont to move. Reviewing the unusual 

 concentration of weight and propelling power in the hind-quarters 

 of the Fawn Kangaroo (if we may be allowed to give it a trivial 

 name), the consequent lowering of its centre of gravity, its broad 

 base of support and tenacious grasp on the ground, it is not 

 difficult to surmise what were the habitat and mode of life of the 

 animal. Who that has seen the Rock Wallaby at home can 

 doubt that its feet and whole economy are fitted to scale heights 



