96 
FOSSIL JAWS OF MACROPODIDJi, 
M. giganteus, a distinct cusp separated from the lobe before and 
behind by clefts, but connected with it by an apical link. 
Examples — -four. 
Mandibular. — The alveolar longitudinal moiety of a right ramus 
with the first three molars, of which each is somewhat imperfect, 
and the core of the premolar (8868); the vascular foramen is 
well marked; the portion of the socket of the incisor preserved is 
directed upwards at an angle of about 45° — A left premolar 
(10216); unworn. 
Maxillary. — A left premolar (10214), unworn — A second 
example (10215); shorter and subtriangular rather than ovate, a 
little worn but well characterised. 
Sthenurus oreas, n.s. 
Longitudinal links of lower molars low but distinct, continuous 
with the outermost of the incumbent folds which are fewer than, 
but as broad as, in IS. pales; posterior basal rim bulging but not 
forming a talon. Mandible thick, symphysis anchylosed, incisor 
highly inclined, posterior dental oritice level with the teeth. 
Upper molars with rudimentary mid links continuous with the 
innermost and largest of the incumbent folds which resemble 
those of the lower teeth but are on each face of the lobes; outer 
mid valley closed by a marginal fold proceeding from the outer 
end of each lobe (PL xvi. fig. 8). Upper premolar very like that 
of S. pales, but wants the subsidiary cusp. 
Dimensions. 
Mandibular. — The full series of cheek-teeth is 62-2 in length 
(1); the entire molar series 58-0 (1); the first three molars 41-5 
(1); m. 3 14-6 (1); the premolar 11*9 (2). The width of m. 3 is 
from 12-1 to 13 -2 (4). The anterior depth of the mandible is 
34-2, the posterior 35-5, the thickness from 22-5 to 25'8 (2). 
Maxillary.- — The first three cheek-teeth measure 42*0; the first 
three true molars 40*2 in length; m. 2 , m. 8 from 27*2 to 27*6; 
