299 



From the alluvial or newer tertiary deposits in the bed of the Conda- 

 mine River, west of Moreton Bay, Australia. 



Presented by Lieut.-Col. Sir T. L. Mitchell, CB. 



1475. Part of the distal half of the shaft of the left humerus of a large mam- 



malian animal, showing the musculo- spiral impression between the origin 

 of the deltoid process and the outer condyle. The breadth of the bone 

 at this part seems to have been between four and five inches, its thick- 

 ness is one inch eight lines ; it indicates a compressed form of the bone 

 as in the Wombat, and agrees in this feature, as in size, with the femur, 

 No. 1489. In colour and mineral condition it corresponds with the por- 

 tions of the jaw of the Diprotodon australis, Nos. 1460 and 1401. 



From the alluvial or newer tertiary deposits in the bed of the Conda- 

 mine River, west of Moreton Bay, Australia. 



Presented by Lieut.-Col. Sir T. L. Mitchell, CB. 



1476. The proximal end of the left ulna of a quadruped corresponding in size 



with the Diprotodon australis. The olecranon is trihedral, smooth and 

 concave on each side, rough and flattened posteriorly ; the circumference 

 of its base is eight inches ; its summit is broken off, and the articular 

 surface of the sigmoid cavity, which projects from the shaft of the bone, 

 is unfortunately too much mutilated and fractured to convey an idea of 

 its original form, or give evidence of the presence or amount of rotation 

 between this bone and the radius. The breadth of the base of the ole- 

 cranon is three inches, its thickness at its posterior expanded and flattened 

 part is two inches three lines. This fossil indicates a massive and power- 

 ful fore-arm, and, by the size of the fractured end of the shaft of the bone, 

 that the ulna extended to the carpal joint, and had an equal if not 

 superior development to the radius. The canal for the medullary artery 

 enters on the inner side below the sigmoid cavity, and is directed inwards 

 and a little upwards. The fossil presents the same colour and mine- 

 ralized, broken and cracked condition as the portions of the jaw of the 

 Diprotodon australis, Nos. 1460 and 1461. 



From the alluvial or newer tertiary deposits in the bed of the Conda- 

 mine River, west of Moreton Bay, Australia; 



Presented by Lieut. -Col. Sir T. L. Mitchell, CB. 



