36 ] 
RECORDS OF IV. A. MUSEUM. 
Lastly, there is a specimen comprising the four molars, the 
last almost in place, the base of the coronoid and the posterior 
portion of the horizontal ramus which is of interest, as the teeth 
have a somewhat different type of ornamentation from that of the 
previous rami and are somewhat smaller. The ramus, too, is more 
slender and has a decided angle at the posterior lower end of the 
horizontal ramus in place of the graceful curve that characterises 
S. occidentalis. In these respects it resembles the right ramus of a 
young individual obtained in the cave when the deposit was 
discovered some years ago. 
These rami of young examples of S. occidentalis are of value, 
as they allow us to form a better idea of the appearance of fresh 
and unworn molars. 
The type specimen is the mandible of an old individual, 
rendering the accurate description of these teeth rather difficult. 
It is gratifying to be able to state that a careful examination of the 
teeth of these younger examples has confirmed the statements 
made in my report to the Caves Board of W.A. some months ago. 
The only additional feature to which attention may be drawn being 
the fact that the outer aspect of the “ external incumbent fold on 
the fore lobe which sweeps round to form the sharp ridge along the 
anterior talon of the tooth,” is ornamented with two or three 
vertical folds which are most prominent on the true molars. Mi to 
M3, and only rudimentary on M4. 
The angle at the base of the coronoid of the younger individuals 
to which reference was made above, is a character which loses its 
sharpness as the animal increases in size, for we have several 
intermediate stages from a young animal with its deciduous molars, 
D2-D3, still in position, to the aged individual that has had its last 
molar (M4) in use for some considerable time. As might be 
expected, these younger animals have a ramus which is considerably 
shorter, shallower, and much more slender than that of a full grown 
member of the same species. It must also be added that their 
teeth, too, possess a rather smaller “ crown only ” measurement, as 
they are comparatively speaking unworn and preserve all the sharp 
edges of the crowns or ridges of the lobes, the links, talons and 
folds. 
