CllEODONTA. 
09 
considerable number of fragments of bones of the skeleton. The third 
includes a number of superior molars of both sides of the skull. 
The posterior true lower molar is larger than the penultimate. Its heel 
is very small, and has its border elevated all round; the inner tubercle only 
marks about half the elevation of the outer, which is also considerably more 
elongate than the anterior. At the point of junction of the last-named cusps, 
there is a fissure which completes the sectorial effectiveness of their blade¬ 
like opposed edges. There is no cingulum except a trace at the antero- 
external base. There is a well-marked tubercle at the anterior base of the 
anterior cusp. The penultimate molar is distinguished by the larger heel 
and smaller median cusp. The inner border of the heel is elevated and 
acute; the inner tubercle marks more than half the external cusp. There 
are no cingula, and no subordinate tubercles. The last premolar has the 
usual anterior cusp and posterior heel, with median cutting-edge. A cingu¬ 
lum descends from the postero-superior angle of the latter to near the base 
of the large cusp ; there are no other cingula. The canine is a compressed 
oval in section. The enamel on all the teeth is rugose, except where 
smoothed by attrition. 
Length of the base of the crown of the sectorial tooth. 0.014 
Width of the base of the crown of the sectorial tooth. 0. 000 
Elevation of the principal cusps. 0. 015 
Elevation of the inner posterior cusps... 0. 007 
Length of the basis of the penultimate molar. 0. 012 
Width of the basis of the penultimate molar. 0. 007 
Length of the heel of the penultimate molar.. 0. 005 
Elevation of the principal cusps .. 0. 011 
Elevation of the anterior cusps. 0. 006 
Long diameter of the canine at the base. 0 .018 
The last molar of the second specimen mentioned differs from the type 
in wanting the anterior basal tubercle ; the heel is also a little larger; The 
last premolar has a tubercle at the anterior base of the principal cusp. The 
humerus is distinguished by the antero-posterimly-compressed form of the 
proximal part of the shaft, caused by the strong projecting ridge which 
descends from the antero-exterior border of the greater tuberosity. The 
posterior face is a flat plane bounded by two longitudinal angles, the outer 
