BY HEBER A. LONGMAN. 85 
deposits on the Darling Downs. Some of the specimens 
accord best with the posterior incisors of Notother1wm 
mitchelli ; others may be more correctly attributed to the 
smaller crania described as Huowenia.* De Vis attributed 
certain Queensland Museum Nototherian specimens to. 
Macleay’s ‘ Zygomaturus trilobus,’ the status of which 
is in dispute, but for purposes of this paper it is not 
necessary here to raise that question. It is sufficient to 
say that these upper incisors should not be separated from 
those of our Nototherian Marsupialia. 
The tubercles noted in the original description are 
more or less prominent in the posterior upper incisors of 
some of these large marsupials. Examples with the teeth 
in situ show that they are decidedly variable. The 
approximate po-ition of such incisors and their relation 
to the lower tusks are well illustrated by a profile photo- 
graph (Plate 1) in H. H. Scott’s Monograph of Notothervwm 
tasmanicum. ft . 
The three examples actually figured by De Vis repre- 
sent very early stages, but there are intermediate speci- 
mens thiough which relationship may be traced to the more 
mature teeth. The persistent pulp cavity is most pro- 
minent in the juvenile, and is less noticeable in older 
specimens. The describer noted this cavity as “ declaring 
relatiouship with the progenitors of the hippopotamus.” 
Several of the upper inci-ors of our Nototherian specimens 
exhibit a basal pulp cavity, and, as a matter of fact, the 
feature is by 1:0 means rare in marsupial upper incisors 
and is well marked in both Phascolomys and Phascolarctus. 
A uon-functional tooth of Thylacoleo figured by Owenft 
shows a similar cavity. 
The remaining type material consists of a molar tooth 
described as ‘“‘a quinque-tuberculate tooth of a bunodont 
type, composed of four sub-conical cusps separated by 
crucial sinuses and supplemented by a post-basal talon 
of similar form.’’ This presents a problem which cannot 
* De Vis, Pr. Roy. Soc. Q’ld.j IV, 1888 (“‘ Owenia ”’) and Proc, Linn. 
Soc., N.S.W., VI, (2), 1891, p. 159. 
+ Tas. Geol. Sur. Rec., No. 4, 1915. 
} Loe. cit., Pl. VII, fig. 12. 
