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Show 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 Fi°- l Partial dissection of the lower jaw of Halmaturus bennettii, showing (a) the incisors in close apposition, (b) fibres of the orbicularis oris muscle, (c) anterior portion of the genio-hyoid muscle of left side, the median line of separation from its fellow of the right side being hardly distinguishable. Fig. 2. Th£ 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. |