PROFESSOR OWEN ON THE SPECIES OP PHASCOLOMYS. 359 



DESCEIPTION OF THE PLATES. 



PLATE L. 

 Fig. 1. Side view of the skull of Fhascolomys platyrhinus. 

 Fig. 2. Back view of ditto ditto. 



Fig. 3. Back view of ditto of Fhascolomys vomhatus. 

 Fig. 4. Ditto ditto of Fhascolomys latifrons. 



Fig. 5. Foramen ovale, var. oi Fhascolomys platyrhinus. 

 Fig. 6. Ditto and part of occiput, var. of Fhascolomys vomhatus. 

 Fig. 7. Ditto and part of occiput of Fhascolomys latifrons. 



PLATE LI. 



Fig. 1. Top view of skull of Fhascolomys platyrhinus. 

 Fig. 2. Fore end of cranium of Fhascolomys platyrhinus. 

 Fig. 3. Nasal bones, var. of Fhascolomys vombatus. 

 Fig. 4. Ditto, var. 2, of ditto. 



Fig. 5. Ditto of Fhascolomys latifrons. . 



PLATE LII. 



Fig. 1. Base view of skull of Fhascolomys platyrhinus. 



Fig. 2. Upper incisor, side view ; and 2', section, ditto. 



Fig. 3. Fu-st and second upper molars, magnified 2 diameters, ditto. 



Fig. 4. Palate, var. of Fhascolomys vombatus. 



Fig. 5. Ditto, var of Pliascolomys latifrons. 



PLATE LIII. 



Fig. 1. Base view of skull, Fhascolomys latifrons. 



Fig. 2. Upper incisor, side view ; and 2', section c — e, ditto. 



Fig. 3. First and second upper molars, magnified 2 diameters. 



Fig. 4. Supratympanic cells and tympano-squamosal gomphosis, ditto. 



Fig. 5. Vertical longitudinal section of the skuU, ditto. 



Fig. 6. Supratympanic cells and tympano-squamosal suture, Fhascolomys platyrhinus. 



PLATE LIV. 

 Fig. 1. Outside view of mandibular ramus, Fhascolomys vombatus. 

 Fig. 2. Ditto ditto, Fhascolomys platyrhinus. 



Fig. 3. Ditto ditto, Fhascolomys latifrons. 



Fig. 4. Hind view of ascending branch of ditto, Fhascolomys platyrhinus. 

 Fig. 5. Ditto ditto Fhascolomys latifrons. 



