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. 

 Fig. 1. — Lateral view of a skull of Macropms Jukesii, Mel. (Nat. size.) 

 Fig. 2. —Superior view of the same. (Nat. size.) 

 Fig. 3. — Teeth of the upper jaw and the palate, with the transversal folds 



of M. Jukesii. (Nat. size.) 

 Fig. 4. — Teeth of the lower jaw. (Nat. siz.) 



Fig. 5. — Lateral view of the incisors of M. Jukesii. (Four times nat. size.) 

 Fig. 6. — Under surface of the 8 right incisors. (Four times nat. siz.) 

 Fig. 7. — Macropus gracilis, Mel. (Sketch after a stuffed specimen of the 



Macleay-Museum. ) 

 Fig. 8. — Lateral view of the incisor of M. gracilis. (Four times nat. size.) 



