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Explanation of the Plates. 

 PLATE L. 



Fig. 1. Upper view of anterior portion of skull of Phascolomys Mitchelli. 

 Fig. 2. Upper view of anterior portion of skull of Phascolomys Krefftii. 

 Fig. 3. Kight side view of anterior portion of skull of Phascolomys Mitchelli. 

 Fig. 4. Left side view of the same skull. 

 Fig. 5. Under view of the same skull. 



Fig. G. Front view of the portion of skull of Phascolomys Krefftii. 



Fig. 7. Portion of left maxillary, Phascolomys Mitchelli. 



Fig. 8. Palatal surface and upper molars of Phascolomys Mitchelli. 



PLATE LI. 



Fig. 1. Palatal surface and upper molars, Phascolomys Mitchelli. 



Fig. 2. Side view of the same portion of skull. 



Fig. 3. Front view of the same portion of skull. 



Fig. 4. Back view of the same portion of skull. 



Fig. 5. Side view of the left maxillary, Phascolomys Mitchelli. 



Fig. 6. Front view of the same portion of skull. 



Fig. 7. Palatal surface and molar teeth of ditto. 



Fig. 8. Outside view of right mandibular ramus of Phascolomys Thomsoni. 



Fig. 9. Upper view with grinding-surface of lower molars of the same fossil. 



PLATE LIL 



Fig. 1. Outer side view of the right mandibular ramus, Phascolomys vomhatus. 

 Fig. 2. Outer side view of the right mandibular ramus, Phascolomys plat yrhinus. 

 Fig. 3. Outer side view of the right mandibular ramus, Phascolomys latifrons. 

 Fig. 4. Outer side view of part of the right mandibular ramus, Phascolomys latifrons. 

 Fig. 5. Outer side view of part of the right mandibular ramus, Phascolomys latifrons. 

 Fig. 6. Outer side view of the hind part of the right mandibular ramus, Phascolomys 

 Krefftii. 



Fig. 7. Outer side view of the fore part of the right mandibular ramus, Phascolomys 

 Krefftii. 



PLATE LI 1 1. 



Fig. 1. Upper view of mandible and mandibular teeth, Phascolomys vomhatus. 

 Fig. 2. Upper view of mandible and mandibular teeth, Phascolomys plat yrliinus. 

 Fig. 3. Upper view of a portion of the left mandibular ramus with the last two molars, 

 Phascolomys Krefftii. 



