326 



1748. The skull, wanting the lower jaw, of an older individual of the Red-bellied 

 Kangaroo (Macropm Bittardierii). 



The molar series of j~ here consists of the premolar and four true molars. A rudimental 



canine is still preserved on the left side of the upper jaw. 



Mus. Brookes. 



1749. The skull of a male Houtman's Kangaroo (Macropus Houtmanni, Gould). 



Mus. Gould. 



1750. The skull of a female of the same species (Macropus Houtmanni). 



The adult dentition is shown in both : minute sockets of germs of canines may be seen in 

 the upper jaw of the male. 



Mus. Gould. 



1751. The skull of a Long-tailed Hare-Kangaroo (Lagorchestes leporo'ides), from the 

 north of South Australia. 



The dental formula is, i ^, c ^, p |^, m jE}=30. The canines are rudimental : the 

 molars in the present individual consist of the two deciduous molars and three anterior true 

 molars. The premolar is exposed on, the right side of the upper jaw. 



Mus. Gould. 



1752. A skull of the Hirsute Hare-Kangaroo (Lagorcliestes hirsutus). 



The deciduous molars are displaced, and the crown of the premolar exposed on the right 

 side of the upper jaw. The second deciduous molar is preserved on the left side of the upper 

 jaw, and both deciduous molars on each side of the lower jaw. 



Mus. Gould. 



1753. The skull of a young individual of the same species of Hare-Kangaroo. 



The deciduous molars and the three anterior true molars are in place. The germ of the 

 premolar is exposed on the right side of the upper jaw : there are germs of canines also in 

 the upper jaw. 



Mus. Gould. 



1754. The skull of the Broad-headed Hare-Kangaroo, Lagorchestes campestris (Bet- 

 tonffia campestris, Gould). 



The affinities to the preceding more typical examples of the subgenus are shown by the 

 very rudimental canines, by the fewer and fainter grooves on the premolar, by the larger size 

 of its posterior inner tubercle, and by the smaller size of this tooth as compared with the 

 typical Hypgiprymni ; by the larger relative size of the true molars, and the stronger deve- 

 lopment of the transverse ridges connecting their outer and inner tubercles ; and above all 



