330 



cancellous texture. There is no canal for the medullary artery at the 

 part corresponding to that in the foregoing fossil. 



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, C.B. 



1526'. The right humerus of a young Kangaroo, sawn across below the deltoid 

 ridge to show the compact wall and large medullary cavity in that part 

 of the shaft which is occupied by the close cancellous tissue in the pre- 

 ceding fossil. Purchased. 



1527- The distal end of the left femur of a Kangaroo, probably Macropus Atlas, 

 having a circumference of ten inches and a half, that of the same part in 

 a full-grown male Macropus major being eight inches and a quarter. 

 The extinct larger species offers the characteristic production of the outer 

 and posterior angle of the outer condyle, and the depression at the side 

 of the condyle above this process ; it also presents the second depression 

 in advance of the preceding, and the same disproportionate size of the 

 outer division of the rotular surface, which is more convex in the fossil 

 than in the recent Kangaroo. The transverse breadth of the posterior 

 part of the outer condyle is relatively less, as compared with the same 

 part of the inner condyle, than in the recent Kangaroo. The fossil is 

 heavily impregnated with mineral matter. 



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

 inine River, west of Moreton Bay, Australia. 



Presented by Lieut. -Col. Sir T. L. Mitchell, C.B. 



1528. The distal end of the left femur of a second gigantic species of Kangaroo, 

 probably Macropus Titan, which measures in circumference eleven 

 inches and a half. In this species the breadth of the posterior part of 

 the outer condyle is relatively greater than in the foregoing specimen, and 

 the breadth of both condyles is relatively greater than the antero-pos- 

 terior diameter of the distal articular surface : the outer division of the 

 rotular surface is less convex than in the preceding species ; the depression 

 above that surface is shallower ; that on the side of the inner condyle is 

 deeper. The contour of the circumference of the distal end of the shaft 



