308 



present femur may have belonged to a young individual of the Australian 

 Mastodon. 



From the Darling Downs, S.W. of Moreton Bay. 



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



The following specimens of the Diprotodon australis, from No. 1490 to No. 

 1503 inclusive, were discovered by Patrick Mayne, Esq. during the operations of 

 sinking a well near Mount Macedon, in the district of Melbourne, near Port 

 Philipp, Australia. 



1490. The under part of the base of the left incisive tusk of the Diprotodon 

 australis ; showing the line where the rugose-punctate, as if worm-eaten, 

 enamel ceases at the angle between the under and inner surfaces of the 

 tusk, and the coat of cement covering the unenameled dentine : the 

 smooth pulp-cavity gradually widening to the base of the tusk is exposed 

 to the extent of three inches. This portion of a great incisor is identi- 

 cal in form and structure with the specimen from the bone-cave of Wel- 

 lington Valley, figured and described in Sir T. L. Mitchell's ' Expeditions 

 into Australia,' vol. ii. p. 362, pi. 31. fig. 1 and 2, and with that from the 

 Condamine River, No. 1460. Presented by Dr. Hobson. 



1491. A fragment of the right ramus of the lower jaw of the Diprotodon 



australis, with the anterior fang and posterior half of the crown and 

 fang of apparently the second molar ; the summit of the posterior ridge has 

 just begun to be worn, and a transverse crescentic line of dentine, with the 

 concavity turned forwards, is exposed. The broken anterior fang displays 

 the longitudinal indentation or channel with which its posterior surface is 

 impressed : the posterior fang is similarly impressed longitudinally upon 

 its anterior surface. The reticulo-punctate character of the enamel is 

 well expressed. The sockets of the two fangs of the small anterior 

 molar are traceable in this fragment. 



From the alluvial or newer tertiary strata in the district of Melbourne, 

 Australia. Presented by Dr. Hobson. 



1492. The crown and beginning of the fangs of the antepenultimate molar, 



right side, lower jaw, of the same Diprotodon australis : the form of the 



