MAMMALIA. 



337 



LonchopTiorus, from the caverns of Brazil; Trogontherium, 

 Steneqfiber, Palaomys, Chalichomys, Chelodus, from the falu- 

 nian stage ; and Theridomys, from the sub-apennine stage of 

 France and Germany. Fossil species of existing genera are 

 found in the different stages of the tertiary epoch, and in 

 the caverns of the old and new world. 



6th Order. CHEIROPTERA (or bats). Have the bones 

 of the anterior extremities greatly developed, and the fingers 

 much elongated to support a delicate membrane. By this 

 metamorphosis the arm and hand is adapted to form a wing. 

 The fossil species of this order belong to existing genera. 

 They are found in the eocene and miocene stages of England 

 and France, the miocene stage of Grermany, and in the 

 caverns of Europe and South America. 



7th Order. AMPHIBIA which includes the seals. Have 

 the extremities modified and arranged for swimming. To 

 this order belongs the TricJieclius, which frequents the seas 



FIG. 248. Felis tigris. 



of the north. Fossil species of this genus are found in the 

 middle stage of the tertiaries of France and England. 



8th Order. CARNIVORA. Have the jaws armed with 

 incisor, canine, and molar teeth (fig. 249) : the tiger is typical 



