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PEOFESSOK OAVEN OX THE FOSSIL MAMMALS OF AUSTEALIA. 



Explanation of the Plates. 

 PLATE XXXII. 



Fig. 1. Base of skull and working-surface of the teeth of the upper jaw, Phascolomys 

 lafifrons. 



Fig. 2. Part of base of skull, with working-surface of some molar teeth, Phascolomys 

 medius. 



Fig. 3. Left side view of the same fossil. 



Fig. 4. Right side of fore part of the same fossil. 



Fig. 5. Front view of premaxillary part of the same fossil. 



Fig. 6. Fractured surface of ditto, showing transverse section of the implanted part of 

 the incisors, i, i. 



Fig. 7. Inner side view of the crowns of the three anterior molars and fore lobe of the 

 fourth molar of the same fossil. 



PLATE XXXIII. 



Fig. 1. Base of skull and working-surface of the teeth of the upper jaw, Phascolomys 

 plafyrhinus. 



Fig. 2. Part of base of skull, with fractured and working-surface of some molar teeth, 



Phascolomys medius. 

 Fig. 3. Left side view of the same fossil. 

 Fiff. 4. Posterior fractured end of the same fossil. 



Fig. 5. Front view of premaxillaries and fractured incisors of the same fossil. 

 Fig. 6. Inner side view of exposed part of the three anterior molars and fore lobe of the 

 fourth molar of the same fossil. 



PLATE XXXIV. 



Fig. 1. Outside view of portion of right mandibular ramus, Phascolomys medius. 

 Fig. 2. Inner side view of the same fossil. 



Fig. 3. Upper view and grinding-surface of molar teeth of a mutilated mandible of 

 Pltascolomys medius. 



Fig. 4. Front fractured end, with section of implanted part of the lower incisors of the 

 same fossil. 



Fig. 5. Ilind fractured end of left ramus of the same fossil. 



