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b. Prehension and occision. Upper and lower incisors remarkably 
kangaroo-like for prehension and cutting. Large papilla incisiva, also 
kangaroo-like. Opposes lower incisors. Incisor arrangement func- 
tionally more or less shrew-like. Palatal ridges closely resembling 
those of the Macropodidse and Eudromicia among the Phalangeridse 
(Lonnberg). Upper premolars small, pointed; cooperate with small 
lower incisors and lower premolars to kill insects. 
3. Organs of mastication. 
a. Upper and lower molars (Fig. 1. Description by present writer): 
mi-m^ tuberculosectorial, with expanded posterior V and large talonid 
basin. The large talonid implies a large protocone in the upper molars ; 
Fig. 1. Diagram Showing Occlusal Relations of the Parts of the Upper 
AND Lower Molars. 
The metacone {me) and metaconule {ml) of the upper molars have their normal 
spatial relations with the parts of the lower teeth. 
UPPER MOLARS 
LOWER 
MOLARS 
pr, protocone 
Trigonid 
Talonid 
pa, paracone 
protoconid 
hy^, hypoconid 
me, metacone 
pa*^, paraconid 
en^, entoconid 
ml, metaconule 
hy, hypocone 
me^, metaconid 
the greater transverse width of the talonid as compared with the 
trigonid invariably implies that the para- and metacones are well 
separated. The fact that the trigonid basin is well above the level 
of the talonid basin implies that the protocone is higher than the hypo- 
cone. The marked anteroposterior length of the first three lower 
molars implies a corresponding lengthening of the upper molars. 
There is practically no trigonid basin in the fourth lower molar and 
so there should be, and indeed there is, no hypocone on the third upper 
molar. The enlarged entoconid of mi _3 fits lingually between the 
proto- and the hypocone. 
The metaconule (ml) of the upper molars furnishes an additional 
cutting blade that works between the hypoconid of one lower molar and 
