RECORDS OF W.A. MUSEUM. 
[35 
of Sthenums occidentalis the species I had the honour to examine, 
describe and name for the Caves Board. 
The most perfect specimen consists of the left ramus showing 
the condyle, the outer “ pouch ” the fenestral vacuity, the fenestral 
foramen, and the posterior outlet of the dental (vascular) canal ; 
but wanting the upper portion of the coronoid process. All the 
cheek teeth are present, though fairly worn ; of the incisors only 
the bases are preserved, the teeth themselves having most likely 
been lost in the course of the excavations. There is a complete 
anchylosis of the symphysis as in the type specimen. 
Of the right ramus we have all the cheek teeth in good 
condition, but not a trace of the ascending ramus, the coronoid 
process. 
All the measurements practically coincide with those of the 
type, there being only an occasional variation of less than imm. 
Judging by the amount of wear exhibited by the teeth, the animal 
evidently attained a considerable age before it met its death. 
A second specimen consists of the practically complete left 
mandibular ramus comprising the incisor, all the cheek teeth, 
practically all the coronoid, the condyle, and what is so often 
missing, the angle, in this case almost intact. 
The specimen is evidently a Stheniirus occidentalis, almost every 
measurement agreeing with the type. 
There are two additional specimens consisting of the four 
molars of the right and left ramus respectively, in which all the 
teeth show signs of wear, the dentine being exposed in Mi, and 
also slightly in M2. The whole series measure 47mm. against 
45mm. in the type, but I have no doubt that these two belong to 
the same species, being simply the remains of a larger individual. 
There is no appreciable difference in the tooth sculpture between 
these and the type molars. 
