1867.] 



DR. J. MURIE ON PHASCOLOMYS PLATYRHINUS. 



801 



an equal age (e. g. adult to adult or youug to young) the same diffi- 

 culty would not be encountered. 



In my former paper (P. Z. S. 1865, p. 847) I have set down the 

 specialities of P. j)hitijrhinus, as compared with P. loomhat, to be 

 these four : — (a) The greater size of the cranium. (6) The greater 

 relative breadth of the nasal bones, (c) The moderately deep tym- 

 panic excavation, {d) The more triangular form of the posterior 

 palatine foramina. 



In elucidation of the proportional magnitude of the crania of the 

 three species of Wombat I append the subjoined table. Tlie first 

 column represents the lately acquired skull of P. ■platyrhinus (the 

 larger animal figured in PI. XXXV.), and the two next columns 

 those of the specimens of P. latifrons. They are each taken in inches 

 and lines, and correspond to the table of admeasurements of skulls 

 given in my former paper. The remaining columns respectively 

 show in twelfths of an inch the average of seven specimens of P. 

 platyrhinus, six of P. wombat, and four of P. latifrons. 



Measurements of Skulls and Series of Average Proportions. 



Wo a 



Total length of cranium 



Greatest width, wliich is at the posterior 1 



part of the zygomatic arch J 



Width of skull behind orbits, where con- \ 



tracted by temporal fossa; J 



Width at anterior part of zygomatic arch . . . 

 Length from occipital crest to temporal fossa 



Length of nasal bones 



Width of same behind 



Width of same near apex 



Length of frontal bones 



Width of same between orbits 



Width of each intermaxillary bone as seen "[ 



from above J 



Length of palate 



Width between anterior molars 



Width between posterior molars 



Width of both superior incisor teeth 



Depth of same taken singly 



Distance between incisor teeth (upper jaw) | 



and molars J 



Total extent of row of molar teeth 



Length of lower jaw 



Greatest breadth of same 



Height in a vertical line dropped from \ 



coronoid process f 



Width of lower incisors 



Depth of the same 



in. lin. 



8 9 



2 2 



4 7 



2 3 



3 3 



2 3 

 9 



3 5 

 2 6 



11 



4 9 



6 



1 



8J 



6 



2 



2 3 

 6 9 



5 11 



3 7 



7i 



4i 



to 6 p 

 WE< 



in. lin. 



6 8 



4 9 



1 7 



3 10 



1 11 



2 3 

 2 44 



1 1 



2 'H 



2 9 



2 



3 7i 

 5 

 10^ 

 10 



3 



1 7i 



1 10 



5 3* 



5* 



n 



G 

 3 



S 3 2 

 § S S 

 Wo<£ 







lin. 

 3 



3i 



1 6 



64 

 11 

 1 

 2 





 2 



5 



44 



94 



84 

 3 



1 64 



10 

 9 



IJ 



3 1 



5i 

 3 



lines. 

 92 



67 



24 



53 

 26 

 34 

 26 

 10 

 34 

 29 



4 



10 



9 



5 



17 



2G 

 71 



68 



36 



7 

 4 



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a) c c £ 



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