485 



concomitant parts of the skeleton, not in the molar teeth, or in a very inferior degree 

 to that shown in the comparison of Proc. Rapha and Proc. Goliah. 



In like manner the question might be raised whether Procoptodon Rapha might not 

 be the male of Proc. Pusio ; but the degree of difference in the size of the dental series 

 (as shown in Plates XCI. & XCIII.) negatives the supposition, and, of course, equally 

 excludes the hypothesis that the species Proc. Pusio has been founded on a female of 

 Proc. Rapha. 



I may finally add that every additional specimen, or comparable fragment, of the 

 three extinct species of the present seemingly extinct genus of osculant Macropod has 

 concurred in demonstrating the constancy of the characters assigned to them. 



Description of the Plate. 



PLATE CXXVIII. 



Procoptodon Rapha. 



Fig. 1. Outer side view of right mandibular ramus and teeth. 

 Fig. 2. Inner side view of molar series and contiguous parts of the same ramut, 

 Fig. 3. Upper view of the same ramus and teeth, with fore part of the left ramus. 

 Fig. 4. Sym'physial articular surface and socket of incisor. 



All the figures are of the natural, size. 



51* 



