RECORDS OF W.A. MUSEUM. 
i8] 
'I'he Dentition. 
None of the teeth of the upper jaw are in position, but fortu- 
nately ten of them were recovered from the “ blow hole.” 
The incisors, unlike Owen’s figures, have no sharp anterior 
edge, differing in this point from all the species described in Owen’s 
work, their section too, being broad and oval, is rather more like 
that of P. latifrons, though the coating of enamel is of greater extent 
than is usual in this species ; the faintness of the grooves reminds 
one of P. miichelli [platyrhinus). 
The pre-molars have the characteristic form of those of P. 
rnUchelli {platyrhinus). They present a sub-triangular transverse sec- 
tion or working surface, the base being backwards, the apex forward ; 
the inner side is shorter than the outer side, and is indented near the 
apex by a groove traversing the tooth lengthwise ; the outer angle 
of the base is .somewhat elongated by oblique attrition. The 
enamel begins anteriorly at the outer part of the apex, opposite the 
groove, is continued inwards and backwards, and upon the base (of 
the triangle) two-thirds of the way towards the outer angle, which, 
with the outer side of the tooth to near the anterior angle or apex, 
is coated only by cement. 
The molars from Mi to M4 (D4-M3 of Owen) are all repre- 
sented in the six teeth figured, with the exception of M4 (M3 of 
Owen), which are both missing, that is if we compare them with 
Owen’s figures of P. platyrhinus. On the other hand, the same 
authority’s drawings of P. miichelli show last molars which differ 
very little from the anterior ones, in which case it is very likely 
that we have examples of all the cheek teeth from Mi to M4. The 
teeth are all more or less coated, and as they are of comparatively 
little value for specific determination, it was thought wiser not to 
attempt to clear them of matrix. 
The Mandible. 
Taking Owen’s figures of the lower jaws as the .standard, it is 
seen that in P. latifrons the curve of the under surface is much more 
pronounced than in P. mitchelli {platyrhinus), and that the inner 
angle of the condyle is much less produced in the latifront type, or 
in Owen’s words ^ “ the curve of the lower jaw is deeper, the 
1 Owen, Osteology of the Marsupialia Trans. Zool. Soc., Vol. Ill , p. 304, and 
Vol. VIII., p. 353. 
