22 STUDIES IN TASMANIAN MAMMALS, LIVING AND EXTINCT, 



sociationg with more perfect specimens. De Vis' con- 

 tentions may be summed up as follows : — 



1. The skull claimed by Owen was not the correct 



cranium of N ototherium at all, and still stood 

 generically distinct under the name of Zygoma- 

 turus, with characters duly detailed. 



2. That Lydekker's creation of a family Diproto- 



dontidce was unwise, and that the only family 

 that really existed was that of Nototheriidoe, of 

 which Diprotodon was a genus. 



3. That the family just named included the follow- 



ing senera : — 



NOTOTHERIIDJZ 



Dentition : 



General characters : Posterior upper incisors small. 

 Premolars, except in Zygomaiurus, subtriangular, uni- 

 cuspid ; with a posterior talon. Molars transversely bi- 

 lobed, the upper without longitudinal ridges, talons an- 

 terior-posteriorly narrow. Scapula long and narrow. Ilia 

 greatly expanded. Limbs gressorial, approximately 

 equal; their proximal bones elongate, simple. Foot 

 broad, tail short, tapering. 



Synopsis of Genoa. 



N ototherium . 



Incisors : Upper premolars subtriangular, unicuspid ; 

 cranial habit and length of muzzle moderate. Crowns of 

 first incisors contiguous, or slightly diverging, the lower 

 incisors proclivous. Posterior upper incisors on the edge 

 of the jaw; cus^ of premolar with a shallow posterior 

 cleft. 



Diprotodon. 



Posterior upper incisors near middle line of the jaw; 

 cusp of the premolar with a deep lateral cleft. 



Zygomaturus. 



Upper premolar oval, tuberculated ; cranial habit 

 ver^ massive, with short expanded muzzle. 



