BY C. W. DE VIS. 
95 
rim forming a rather distinct talon with a rudimentary link rising 
upon the lobe. Incumbent folds on the face of the lobes well 
marked. Ledge of upper premolar distinct and continuous fore 
and aft, a subsidiary cusp on the hinder end of the outer side of 
the crown. Size large, about equal to that of S. goliah. 
Dimensions. 
Mandibular. — The first three true molars are together 56*0 in 
length; the premolar 18-0. The width of m. :3 is 18-0. The 
thickness of the mandible is not less than 27*5. 
Maxillary. — The premolar is 21-0 x 14-1 in one example; 19*6 
x 15*0 in other. 
Form of teeth. 
Mandibular. — P. 4 (PL xv. fig. 3). Elongate-ovate, diameters 
18-0 x 8-2, structurally similar to that of S. goliah, but differing 
from it in form and size, and in the latter character agreeing with 
the upper premolar (10214 the type of the species). On the 
inner surface of the crown of this tooth are six distinct ribs, five 
of which form denticulations on the crest; these are not present 
in S. goliah. 
Molars. — (PL xv. fig. 1). The lobes of the molars are remark- 
ably thin and flat or even a little concave on the posterior surface 
their crests perfectly straight and their angles sharp. The 
incumbent folds are much the more numerous on the anterior 
lobes, the outermost of them being the largest and forming by its 
repetition a regular series in the line of the teeth. The hinder 
surfaces of the lobes are faintly sculptured into numerous obscure 
folds. In size the molars agree with those of S. goliah. 
Maxillary. — P 4 (PL xv. fig. 2). Elongate-ovate with the angles 
rounded and tumid; diameters 22-0 x 15*0. Crest central; 
mesial region of outer side of crown with a few vertical ribs. 
Inner side of crown a rectangular ledge from end to end connected 
with the lobe by numerous transverse ribs. To the end of the 
outer side of the crown is attached, as in the deciduous tooth of 
