EXPLANATION OF THE PLATES. 



Plate XXXIX. 



Fig. 1. Molar milk-tooth of a Mastodon, seen from beneath. 



Fig. 2. The same seen from above. 



Fig. 3. A side view of the same. 



Fig, 4. Part of the tusk of a Mastodon fractured transversely, showing its intersected 

 appearance like the engine-turning of a watch-case. 



Fig. 5. Symphysis of the lower jaw of a small Tapir. 



Fig, 5*. End of the same, showing fragments of incisors. 



Fig. 6. Upper molar tooth of Mastodon elephantoides. 



All these figures are of the natural size. 



Plate XL. 



Fig. I. Two molar teeth of the upper jaw of a Rhinoceros. 



Fig. 2. Fragment of the lower jaw of the same animal (about the centre). Three 

 molar teeth are shown much worn. 



Fig. 3. Inside view of the posterior part of the left side of the lower jaw of a Hippo- 

 potamus. 



Ft. In. 



Breadth 3i 



Lower jaw. Length 8 



Breadth 3| 



Another Asiatic (^Mooknah). Length (upper jaw) 8:J 



Breadth 3| 



Compass of one side of lower jaw of the same 2 3^ 



Compass of one side of lower jaw of another large elephant (Dauntelah) . 1 85 



Fossil. 



Grinding surface of fossil elephant's tooth (Bridport). Length .... 8 



Breadth 3^ 



Another, formerly in the Museum of Parkinson. Length 9 



Breadth 2| 



One from Ohio. Length 8 



Breadth 3^ 



One from Siberia. Length 08 



Breadth 3^ 



