328 

 1770. The left os calcis. 1771. The left astragalus. 



1772. The left scaphoid. 



1773. The left tarsus, metatarsus, and phalanges. Hunterian. 



1774. The inferior spongy bones of a Kangaroo (Macropus). Hunterian. 



1775. The carpal, metacarpal and phalangeal bones of a Kangaroo (Macropus). 



Hunterian. 



1776. The shaft of the right tibia and fibula of the Macropus laniyer, in longitudinal 

 section ; showing the close apposition without confluence of the two bones at 

 their distal halves : also the dense walls and medullary cavity of the tibia, and 

 of the proximal part of the fibula. Presented by John Gould, Esq., F.R.S. 



Genus Hypsiprymnws. 



1777. The skeleton of Hunter's Potoroo, or Kangaroo-Rat (Hypsiprymnus Hunteri). 



The inner condyle of the humerus is perforated. The fabellee, or sesamoid ossicles behind 

 the outer condyle of the femur, are preserved. The large metatarsal of the fourth toe of the 

 left hind-foot is swollen and diseased at its extremity : the toe has been lost. The fibula 

 adheres in the lower two-thirds of its extent with the tibia, but the line of separation s ob- 

 vious : in the Hypsiprymnus myosurus the fibula is quite distinct from the tibia. There are 

 7 cervical vertebrae, and the transverse process of the sixth is first perforated by the verte- 

 bral artery : 1 3 vertebrse are dorsal, 6 are lumbar, 2 sacral, and 24 caudal, of which last the 

 third to the nineteenth inclusive bear hsemapophyses. 



The generic character is shown by the normal development of the upper canines, and by 

 the large and grooved premolars. 



Hunterian. 



1778. The skull of Hunter's Potoroo (Hypsiprymnus Hunteri). 



It exhibits the final stage of acquisition of the permanent teeth, the last true molars and 

 all the premolars save one being in place. The right premolar, lower jaw, has not yet dis- 

 placed the two deciduous teeth, which it equals in extent ; and there are, therefore, six teeth 

 in the molar series on this side of the jaw : viz. d 1, d 2, m 1, m 2, m 3, m 4. 



Presented by Dr. Hobson. 



1779. The skull of the same species of Potoroo, vertically and longitudinally bisected. 



