88 



OSTEOLOGICAL GALLERY, 



The crowns of these grinding-teeth are made up of a variable 

 number of lamina or thin plates, each composed of an outer layer 

 of enamel and a core of dentine, the laminae being themselves 

 bound together side to side by a substance known as cement. In 

 the African Elephant each lamina, when seen in section, is lozenge- 

 shaped, so that the grinding-surface of the tooth when worn has the 

 appearance shown in fig. 47. In the Indian species, however, the 

 lamina? have flattened parallel sides, and thus the tooth-surface pre- 

 sents numerous transverse parallel bands of enamel, as in fig. 48. 



Fig. 48. 



Molars of African and Indian Elephants. 



Various modifications of these patterns have been found in the 

 teeth of extinct Elephants, and a large number of species have been 

 distinguished accordingly. 



Suborder HYRACOIDEA. 



[Case 10.] The Coneys (Case 10, Div. A) are of small size, which alone is 

 sufficient to distinguish them from their huge allies; but they 

 are also characterized by their peculiar dentition. The molars much 

 resemble those of the Rhinoceros, whilst the incisors are quite unique 

 in structure and shape, the upper ones being rootless like those of 



