1866.] 



ON THE LOWER JAW OF THE KANGAROOS. 



31 



Kangaroo {Halmaturus bennettii), a young female, the teeth of the 

 lower jaw when close together, as Mr. Waterhouse remarks, fit 



Fig. 1. 



Partial dissection of the lower jaw of Halmaturus bennettii, showing (a) the in- 

 cisors in close apposition, (b) fihres of the orbicularis oris muscle, (c) ante- 

 rior portion of the genio-hyoid muscle of left side, the median line of sepa- 

 ration from its fellow of the right side heing hardly distinguishable. 



Fig. 2. 



The same dissection of the mandible of Halmaturus bennettii as in fig. 1, but 

 showing (at a) the manner of separation of the lower incisors, and how they 

 also override the anterior upper incisors. 



