86 STUDIES IN TASMANIAN MAMMALS, LIVING AND EXTINCT, 



appended, measurements, will supply sufficient data to 

 separate these jaws from those of any other Notoiheria. 

 From the Leptocerathine group, they can he distinguished 

 by the twisted coronoid pfocesses, a character sufficiently 

 well marked to serve all taxonomio needs. 



Greatest length between two vertical 



rods 422 mm. 



Height to condyle 280 ,, 



Length of symphysis 165 ,, 



Greatest depth of the mandible ... 127 



Antero-post&rior length of molar 



No. 4 45 „ 



Width of ditto 35 ,, 



Length of diastema (to base of 



tusk) 55 ,, 



Any of the above measurements that can be compared 

 with those furnished by the Boyd's Collection mandible, 

 will demonstrate their specific and sex similarity of the 

 two specimens. 



TAXONOMIC. 



As we have to deal in the fewest possible words with 

 an extensive mass of notes that directly relate to our 

 subject, we proceed at once to state that Professor Owen's 

 original species, Nototherium mitchelli, of which we con- 

 sider we have determined the sexes, stands apart from all 

 other Notoiheria. The species were horned, and platv- 

 rhine in cranial morphology, and were, moreover, suffi- 

 ciently removed from the remainder of the stirp to found 

 generic characters upon, if such were a desideratum. We 

 rule out Owen's species, Inerme, for the present, but 

 recognise his third species, Victoria , as being part of the 

 second group that includes the following: — 



Nototherium victoria?, Owen Date, 1872. 



Euowenia grata, De Vis. Date, 1887. 



Euowenia robusta, De Vis. Date, 1891. 



Nototherium tasmanicum, Scott. Date, 1911. 



The several relationships within this group still pre- 

 sent difficulties that an accession of future material may 

 banish at any time. Some of these difficulties are direct- 

 ly due to a want of exact knowledge respecting the char- 

 acters that determine sex, in relationship to growth 

 stage®. It looks upon the surface as though Euowenia 

 grata, was a female animal, and the so-called species, 

 robusta, was the male. De Vis admits that robusta was 

 so close to Owen's victoria', that he hesitated upon the 



