teeth of the Delphinus Gangeticus. 
419 
Explanation of Plate XX. 
Fig. 1. A side view of the upper jaw, to show the form of 
the teeth. 
Fig. 2. The same view of the under jaw. Both these figures 
are on a scale of 4 inches to a foot. 
Fig. 3. One of the most perfect of the teeth, of its natural 
size ; it is taken from the lower jaw. 
Fig. 4. A tooth in its growing state, represented of the 
natural size, from the lower jaw. 
3 l 
MDCCCXVin. 
