90 



SKETCH OF THE HlSToKY OF MAMMALIA. 



Genus Eqcus. 



OF this g-enus we have ah'eady treated in a separate 

 volume, and we therefore pass on to extinct fossil spe- 

 cies of this order. 



EXTINCT FOSSIL SPECIES 



Skull of the Fossil Ad apis. 



To the order Pachydermnta Cuvier refefs an extinct 

 animal, of which the remains have been found in the 

 plaster-quarries of Montmartre. The remains, however, 

 are very rare, and we believe that only three fragments 

 of skulls have been recovered. The adapis was evidently 

 a small animal, its skull being only about a third larger 

 than that of a hedgehog. There were four incisors, 



46.— Skull of Fossil Adapis. 



sharp-edged and oblique, in each jaw, followed by a 

 canine tooth of a conical form and not exceeding the 

 molars in length. Of these latter there were seven on 

 each side, in each jaw. In the upper jaw the first 

 molar was trenchant, the second and third surrounded 



