DIPEOTODONTID^. 169 



The following probably belong either to the present or the 

 preceding family. 



46841 1. Three imperfect metacarpals ; from Queensland. The 

 distal articular surfaces are more rounded and less later- 

 ally expanded than in existing species of Phascolomys. 



Presented by Dr. George Bennett, 1875. 



46841 m. Numerous phalangeals of the manus, associated with the 

 preceding. The terminal phalangeals are compressed 

 laterally, instead of vertically as in Phascolomys, while 

 the distal articular trochleae of the second phalangeals 

 are much more developed than in that genus. 



Same history. 



M. 3641. Several metapodials (? metacarpals), agreeing in structure 

 with the preceding specimens ; from Queensland. 



Same history. 



M. 3642. Four terminal phalangeals, agreeing in structure with the 

 ■ corresponding bones of 'No. 46841 m ; from Queensland. 

 Presented by Dr. George Bennett, 1874. 



The following may perhaps belong either to tlie present 

 or the next family . 



42705. Cast of an undetermined imperfect bone. The original was 

 probably obtained from Queensland. No history. 



Family DIPROTODONTID^. 



Dentition : — I. \, C. ^, Pm. \, M. J. The general structure of the 

 cheek-teeth agrees with that of the JS'ototheriida', but there is no 

 trace of a longitudinal bridge in the lower true molars. The upper 

 incisors decrease in size from the first to the third, and those of op- 

 posite sides are in contact in the median line of the palate ; the first 

 pair are scalpriform, coated with enamel only on the anterior sur- 

 face, and grow from persistent pulps. The lower incisors are very 

 large and proclivous. The cranium (fig. 27) is elongated, and has 

 no vacuities on the palate. The general structure of the mandible 

 resembles that of Nototherium, but the inferior border of the ramus 

 is much less elongated. The limbs are of approximately equal 

 length ; the scapula is long and falciform ; the humerus elongated 

 and slender, with a slight distal expansion, and no eutepicondylar 



