S26 



MAMMALS. 



elephants (Proboscidea) ; (d) the Hyraxes (Hyracoidea). 

 And beside the Ungulata it seems legitimate to rank the 

 whales and dolphins (Cetacea), and the rabbits and hares, 

 rats and mice, and other forms included in the order 

 Rodentia. 



On the other side let us place the great series of Carnivora, 

 such as cats, dogs, bears, and seals. Beside these may be 

 ranked the Insectivora, such as hedgehog, mole, and shrew, 

 and the bats or Chiroptera, which seem to be specialised 

 Insectivores. 



In the middle let us place the series which, beginning 

 with the Lemurs, leads through various grades of monkeys 

 to a culmination in man. Among the monkeys are the 

 •small and simple marmosets, the flat-nosed American mon- 

 keys, the dog-like apes of the Old World, and the anthro- 

 poid apes, which most nearly approach man. 



But it must be carefully noted that these orders are often 

 linked by extinct types. Thus, to take in the meantime 

 one instance only, it is believed by some that the extinct 

 Phenacodus has affinities with Ungulates, Carnivores, and 

 Lemurs, suggesting the unity of the three series which we 

 liave dististinguished. 



We may summarise the general classification thus ; — 



UNGUXLATES 



MON 



LEM 



RODXENTS 



CETACEANS 



KEYS 



URS 



INSE /CTIVORES 



SIRENIA 



EDENTATA 



MARSUPIALS 



MONOTREMES 



