TO MEMOISS OF THE QUEENSLAND MUSEUM. 



I'idge. At the border of the mesopterygoid fossa there is a prominent transverse 

 ridge, through which a foramen runs on each external corner. The average 

 depth «of the palate l)elovv the alveolar margins is 7 mm. 



The molar series are in symmetrical arcs, the lobes of the teeth being 

 obliquely set. Fortunately all the teeth are in situ. 



Premolar : The premolar is subtriangular : length 20 mm,, breadth 18 mm. 

 There is a single oblique transverse lobe, on which a wide tract of dentine with 

 a posterior loop is exposed. This has evidently been worn from a single central 

 cusp with a median posterior depression. There is a narrow posterior talon, 

 the lingual border of which is continuous on the inner side with an anterior 

 talon on the contracted front angle of the tooth. This premolar agrees well 

 with that described by De Vis (1888, p. 115) as typical of his X. duucnsc and 

 also illustrated in his accompanying Plate. Both teeth are well preserved in 

 our specimen, and no special dififerences are to be noted between them. The 

 relations of the premolar with those of other Nototheres are commented on 

 elsewhere. 



]\Iolars : The bilophodont molar series is well worn, a tract of dentine 

 8 nnn. wide being exposed on the hind lobe of m*. From m'^ to the front lobe 

 of we'' the series gradually increases in size. The posterior lobe of m^ is less 

 wide than the anterior. 31^ is anteriorly slightly less wide than the corresponding 

 lo])e of m^, and the hind lobe is markedly narrowed. Anterior and posterior 

 talons are well developed throughout, except in the first true molar, where 

 demarcations are lost in the surfaces of wear. The anterior talons on the second, 

 third, and fourth molars are more developed on the lingual surface, whereas the 

 posterior talons are more prominent labially, this being in consonance with the 

 oblique setting of the lobes. On the lingual side the valleys between the lobes 

 are bounded and partly closed by a tubercle arising from cingular processes, 

 but these are not so marked on the outer side. 



Dimensions. nun. 



Antero-posterioi' diameter of molar series with pvi\ right . . . . 172 



Anteroposterior diameter of molar series with pm\ left . . . . 169 



Width of m^, anterior lobe . . . . . ■ . . • • • • . • 28 



Width of nr, anterior lobe . . . . . . . . . . . . . • 35 



Width of m^ anterior lobe . . . . . . . . . . . . . ■ 36.5 



Width of ni\ anterior lobe . . . . . . . . . . . . . - 35 



Palate breadth between outer corners of p«i* . . . . 102 



Palate breadth between outer corners of m^ front lobe . . 158 



Palate breadth between outer corners of m*, hind lobe . . . . 152 



Palate breadth l^etween inner corners of pm*, front lobe . . . • 64 



Palate breadth between inner corners of 7n"', front lobe . . . . 85 



Palate breadth ])et\veen inner corners of m*, front lobe . . . . 90 



Diastema . . . . . . ... . . . . . . . . . . 112 



Palatal length,* palation to gnathion . . . . . . . . . . 390 



*01dfield Thomas, Nomenclature of Measurements, Proe. Biol. Soc. Wash., xviii, p. 192, 

 1905. 



