BY C. W. DE VIS, M.A. 103 
middle of its length, then dilating and forming a rough overhang- 
ing protuberance immediately in front of the premolar; the 
alveolar tract descending with a slight curve ventrad from the 
premolar to the postmolar platform; the anterior outlet of the 
dental canal wide, and placed about 25 mm. below the edge of the 
diastema, and likewise in front of its protuberance; the root of 
the coronoid process occupying the lower two-thirds of the ramus 
posteriorly, and gathering volume from the convexity of the 
mandibular wall, which commences on the lower half of the space 
beneath the premolar, its upper edge becoming free on a lower 
horizon than usual, and in this aged example springing upwards 
opposite to the hinder lobe of m*; the anterior edge of the 
coronoid plate making with the longitudinal axis of the ramus an 
angle of about 75°; the coronoid proces elevated and falcate ; 
the ectocrotaphyte fossa of moderate width and depth, shewing 
no trace of an external communication with the dental canal; the 
inner fossa deep and capacious, formed in the angle of the jaw 
solely to the exclusion of the coronoid plate, and amplified by an 
alar expansion of the ascending ramus extending caudad beyond 
the vertical of the condyle; the posterior dental foramen level 
with the worn surface of the last molar; the inner wail of the 
dental canal strengthened by a low angular ridge running from 
the sharp posterior edge of the postalveolar platform to the 
border of the foramen; the articulating surface of the condyle 
almost horizontal, feebly convex longitudinally, and retaining 
nearly the same breadth throughout ; its neck short, the sigmoid 
notch commencing at the edge of the articular surface in front ; 
the “inflected angle” of the jaw narrow and but faintly demar- 
cated by an inward curvature from the concave surface of the wall 
beneath the posterior molars—a long interval separating it from 
the root of the alar expansion; the profile of the ascending 
process undulated, and its inclination, as it rises up from the 
angle, low. 
The affinity of Owenia to the gravigrade diprotodonts known by 
their cranial remains, is plainly expressed by the structure of its 
grinding teeth. Had these alone been left to us, it would have 
been difficult to avoid the error of referring them to a small species 
of Nototherium. ‘The incisors, on the other hand, are so strongly 
differentiated, not only from those of Diprotodon, Nototherium, 
and Sthenomerus but trom those of the phytophagous marsupials 
generally, that had these been our sole guides, we might have been 
led to speculate on the existence of a carnivore more destructive 
than Thylacoleo; but its general relationship being evident, it is 
