148 NOTOTHERIUM CHAP. 
Cuscuses.. The dental formula is 1? Ci Pm? M4; the last 
premolar is a great blade-shaped tooth like that of Potorous. 
Nototherium was a creature smaller than Diprotodon, but still 
of large size; it is believed to have been a burrowing creature, 
and to connect the Wombats with Diprotodon. More certainly 
allied to the existing Wombat was Phascolonus, a Wombat as 
big as a Tapir. 
Of extinct American Diprotodonts the Epanorthidae, already 
referred to in connexion with the living Caenolestes, were the most 
ra 
Bra! 1/5: 
Nototherium mitchelli. Side view of skull. x. (After Owen.) 
prominent forms, The genus Zpanorthus occurs in the Santa Cruz 
formation of Patagonia, which is believed to be Miocene. The 
incisors are three in the upper jaw; and the single incisor of each 
ramus of the lower jaw is a great chisel-shaped, cutting instrument. 
Abderites is also typically Diprotodont by reason of the large 
projecting incisors of the lower jaw. It has a large cutting 
tooth in the lower jaw, which appears to be the last premolar, 
and is thus comparable to the great cutting tooth of the lower 
jaw and’ of the upper jaw of the extinct Phalanger, 7hylacoleo. 
' Quite recently (Proc. Linn. Soc. N.S.W. 1898, p. 1) the carnivorous character 
of Thylacoleo has heen reasserted by Mr. Broom. 
