254 MAR8TTPIALIA. 



35957. A late caudal vertebra of a slightly smaller species ; from 

 Gowrie. Presented by Sir D. Cooper, Bart., 1861. 



38768. A shorter late caudal vertebra of an equally large species ; 

 from Darling Downs. 



Presented by F. N. Isaac, Esq., 1861. 



M. 3704. An imperfect late caudal vertebra of a large form ; from 

 Queensland. Presented by Dr. George Bennett. 



40170. The centrum of a rather smaller late caudal vertebra ; from 

 Darling Downs. Presented by Sir D. Cooper, Bart., 1866. 



36079 *. An imperfect late caudal vertebra of a smaller form ; from 

 the Condamine Eiver. 



Presented by J. H. Hood, Esq., 1861. 



32330. A late caudal vertebra, with a shorter centrum than any of 

 the preceding ; from a cave in the Wellington Valley. 



Purchased,\857. 



42667. A late caudal vertebra of similar proportions ; from the 

 same locality. 

 Presented by the Trustees of the Australian Museum, 1870. 



42667 a. A late caudal vertebra of a smaller form ; from the same 

 locality. Same history. 



Suborder MARSUPIALIA POLYPROTODONTIA. 



Incisors (in existing genera) ^|y, small, and subequal ; canines 

 larger ; molars usually with sharp cusps. In existing genera the pre- 

 molars are normally three, and correspond to the first, third, and 

 fourth of the typical Eutherian series ; but in the Mesozoic Trico- 

 nodon and Amblotherium there are four. Five upper and usually 

 six lower true molars are present in Myrmecobius, at least six in 

 Amphitherium, and seven in Amblotherium. The fourth premolar 

 is smaller than the first true molar, and is never simply secant. 



Family PERAMELID^E. 



Dentition : I. ( p, C. \, Pm. f , M. \. Upper incisors small, with 

 short broad crowns ; lower moderate, narrow and proclivous. Pre- 

 molars compressed and pointed ; the fourth preceded by a milk- 

 tooth. First three upper true molars with squared crowns, usually 



