Saye PALEOTHERIUM. 
PALAZOTHERIUM CRASSUM. 
Tue molar teeth of the lower jaw are, as is usual in the 
herbivorous Mammalia, narrower transversely, and of a 
more simple structure than those to which they are opposed 
above. In the present genus they are seven in number on 
each side of the lower jaw : the first is the smallest, and has 
a simple compressed conical crown: the rest have their 
outer part formed of two half cylinders, except the se- 
venth, which has a third smaller semi-cylindrical lobe. 
Of such a tooth, which was obtained from the Seafield 
quarry, Isle of Wight, two views of the recently formed 
crown are subjoined (fig. 115): @ is the outer side, shew- 
Fig. 115. ing the form above described ; 6 is the 
immer side, shewing the longitudinal 
depressions which penetrate the outer 
lobes or convexities. This tooth, which 
is rather less than the corresponding one 
of the Palaotherium crassum, figured by 
Cuvier, (‘ Ossemens Fossiles,’ 4to, 1822, 
tom. ii. pl. 1, ¢g,) must have belonged 
to a young animal. It had probably 
not cut the gum; certainly not come 
into use, for the margins of the crescentic 
_ Last lower molar, nat. summits of the three lobes are unworn. 
size. Paleeothere. Eocene 
marl, Isle of Wight. In the grinding surface of the tooth 
(fig. 116), which is the fifth of the 
molar series of the lower jaw, and the 
first of the three true molars, the two 
crescents are united by a continuous 
Fifth lower molar, nat. oun! ; 
size. Paleotherium cras-. tract of dentine, the intermediate wall 
sum; Binstead, Isle of p : 
Wight gta ge od of enamel having been worn down. 
