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PEOFESSOE OWEN ON THE FOSSIL MAMMALS OF AUSTEALIA. 
PLATE XL. 
Fig. 1. Inner side view of the fore part of a right mandibular ramus and teeth, Pliasco- 
lomys gigas. 
Fig. 2. Outer side view of incisor of the same fossil. 
Fig. 3. Working-surface of the same incisor. 
Fig. 4. Transverse section of the same incisor. 
Fig. 5. Outer side view of the same fossil (without reversing). 
Fig. 6. Upper view of a portion of the left mandibular ramus and last four molars of a 
smaller Phctscolomys gigas. 
All the figures are of the natural size : the symbols and letters of reference are 
explained in the text. 
