104 



dissection did not bring to light any well-marked morbid appear- 

 ances. 



The external characters of the animal have been so well described 

 and illustrated by the learned Dutch naturalists, MM. Miiller and 

 Schlegel, that further remarks on them may be here dispensed with : 

 the chief modifications of the Kangaroo-form which adapt the herbi- 

 vorous marsupials of the present subgenus to their singular sphere of 

 existence, are a reduction of the length of the hind-limbs to a more 

 near equality with the fore-limbs, which are proportionally longer 

 and stronger than in the land-Kangaroos : the claws of the principal 

 toes in both limbs are longer, stronger, and more curved than in 

 other MacropodidcB ; they are, in fact, the chief instruments enabhng 

 the Tree-Kangaroos to maintain a firm hold on the branches of the 

 trees in which they habitually reside. 



As the bones of the animal chssected are still in maceration, any 

 remarks that the osteology of the Dendrolagus may require, will be 

 communicated at a future meeting. 



Before commencing the dissection the weight of the animal was 

 taken, which was 16 lbs. avoirdupois. 



The length of the animal, from the muzzle to the end of the tail, 

 was 2 feet 1 inch ; the length of the head was 4 inches 9 lines ; the 

 length of the fore-limb, from the head of the humerus, was 12 inches ; 

 that of the hind-limb, from the head of the femur, 1 foot 6 inches. 



The dental formula was : — i ^—r, c ^f—, n -^, m -^=30. The 



1—1' — -* 1 — 1 4 — 4 



canines, confined as above indicated, to the upper jaw, were much 

 smaller than in the Potoroos, indicative of a closer affinity to the 

 Kangaroo family, which affinity was further manifested by the form 

 and structure of the stomach. The premolars presented the great 

 antero -posterior extent characteristic of the subgenus Dendrolagus : 

 they are trenchant, with many minute vertical grooves ; they play 

 upon each other like the blades of scissors, and must perform an im- 

 portant part in cutting off the leaves or fruit, or dividing after they 

 are detached, the natural objects of food of the Tree- Kangaroos : the 

 true molars are double-ridged transversely, as in the Macropodidee 

 generally. 



The tongue is long, narrow, depressed, with a smooth and even 

 dorsum, showing three fossulate papillae at its base, arranged in a 

 triangle with the base turned forwards : the Macropus major has a 

 single fossulate papilla near the base of the tongue. The epiglottis 

 is broad and large, slightly emarginate at its middle part. 



The oesophagus is suspended to the bodies of the dorsal vertebrae 

 by a broad fold of the pleural membranes : it is continued into the 

 abdomen for about 3 inches before terminating in the stomach. The 

 diameter of the tube in a state of contraction is only 3 lines, until 

 within an inch of its termination, when it begins gradually to expand. 



A series of well-marked fasciculi of muscular fibres come off from 

 an oblique tract of the external surface of the termination of the oeso- 

 phagus and diverge in oblique curves which partly surround that 

 termination before the fasciculi spread upon the stomach itself. The 



