BY N. DE MIKLOUHO-MACLAY. 895 



Fig. 8 represents the lateral view of the incisors of M. gracilis 

 (four times the nat. size) and Fig. 5 the corresponding teeth of M. 

 Jukesii (four times the nat. size). 



The comparison of these two figures, shows very marked differ- 

 ence in shape which I do not think could be recognised as sexual 

 differences only, and until it is proved, that the dentition of 

 Kangaroos varies to such an extent, according to the sex, the de- 

 scribed two species have to stand separate. 



EXPLANATION OF PLATE XXXIX. 



-Lateral view of a skull of Macropus Jukesii, Mel. (Nat. size.) 



•Superior view of the same. (Nat. size.) 



-Teeth of the upper jaw and the palate, with the transversal folds 



of M. Jukesii. (Nat. size.) 

 -Teeth of the lower jaw. (Nat. siz. ) 



-Lateral view of the incisors of M. Jukesii. (Four times nat. size.) 

 -Under surface of the 8 right incisors. (Four times nat. siz.) 

 -Man-ojms gracilis, Mel. (Sketch after a stufifed specimen of the 



Macleay-Museum. ) 

 -Lateral view of the incisor of M. gracilis. (Four times nat. size.) 



