326 



molars in situ. The specific distinctions are well displayed in the com- 

 parison of the present penultimate and last molars with those in No. 

 15 1 ; as for example, first, the greater breadth of the tooth in the present 

 species, especially of its anterior division, as compared with its antero- 

 posterior extent ; secondly, the much smaller and lower posterior talon ; 

 and thirdly, the shorter and more simple connecting ridge between the 

 two principal transverse eminences. 



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. 



1515. A portion of the left ramus of the lower jaw of the Macr opus Atlas, 

 with the penultimate molar, and part of the antepenultimate molar in situ : 

 the small posterior basal ridge distinguishes, better than the superior size 

 of the animal, the present extinct Kangaroo from the largest of the ex- 

 isting species. 



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. 



151(5. A similar portion of the left ramus of another individual of the Macropus 

 Atlas, with the penultimate molar, mutilated, the antepenultimate molar, 

 and the next tooth in advance ; the depth of the jaw below the penulti- 

 mate molar is one inch two lines ; the corresponding part in a large male 

 Macropus laniger measures not quite one inch. 



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. 



1517- A portion of the left ramus of the lower jaw, three inches and a half in 

 length, and containing the sockets and fangs of five molar teeth, probably 

 the entire series in use at one and the same time ; the four molar teeth, 

 which constitute the series in one side of the lower jaw of a large male 

 Macropus laniger, occupy an extent of one inch nine lines : I have not 

 seen any lower jaw of this species of Kangaroo, or of the more common 

 Macropus major, with more than four molars in use at the same time, 



