and organs of hearing of the dugong. 155 
Fig. 2. The remains of two incisors in situ; both these 
figures are in the same proportion. 
Fig. 3. The two incisors in a shedding state, removed from 
the jaw, of the natural size. 
Fig. 4. A transverse section of one of the dentes molares, 
represented also of the natural size. 
