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PROFESSOR OWEN ON THE SPECIES OF PHASCOLOMYS. 
DESCRIPTION OF THE PLATES. 
PLATE L. 
. Side view of the skull of Phascolomys platyrhinus. 
. Back view of ditto ditto. 
. Back view of ditto of Phascolomys vombatus. 
. Ditto ditto of Phascolomys latifrons. 
. Foramen ovale, var. of Phascolomys platyrhinus. 
. Ditto and part of occiput, var. of Phascolomys vombatus. 
. Ditto and part of occiput of Phascolomys latifrons. 
PLATE LI. 
. Top view of skull of Phascolomys platyrhinus. 
. Fore end of cranium of Phascolomys platyrhinus. 
. Nasal bones, var. of Phascolomys vombatus. 
. Ditto, var. 2, of ditto. 
. Ditto of Phascolomys latifrons. 
PLATE LIL. 
. Base view of skull of Phascolomys platyrhinus. 
. Upper incisor, side view; and 2’, section, ditto. 
. First and second upper molars, magnified 2 diameters, ditto. 
. Palate, var. of Phascolomys vombatus. 
. Ditto, var of Phascolomys latifrons. 
PLATE LII. 
. Base view of skull, Phascolomys latifrons. 
. Upper incisor, side view; and 2’, section c—e, ditto. 
. First and second upper molars, magnified 2 diameters. 
. Supratympanic cells and tympano-squamosal gomphosis, ditto. 
. Vertical longitudinal section of the skull, ditto. 
. Supratympanic cells and tympano-squamosal suture, Phascolomys platyrhinus. 
PLATE LIV. 
. Outside view of mandibular ramus, Phascolomys vombatus. 
. Ditto ditto, Phascolomys platyrhinus. 
. Ditto ditto, Phascolomys latifrons. 
. Hind view of ascending branch of ditto, Phascolomys platyrhinus. 
. Ditto ditto 
Phascolomys latifrons. 
