PACHYDERMATA. 271 



caverns, and particularly in the Devonshire lime- 

 stone formations ; molar teeth, &c., not unfrequently 

 being washed up by the sea in Plymouth sound. 

 At least nine species have been enumerated, and 

 among these Elephas mammonteus, or Primigenius, 

 has been found complete in the ice of Siberia, with 

 hair on the body, and tusks nine feet in length. 



Besides these, in a former zoology, there existed 

 in the same habitat with Dinotheria, Tapirs and 

 Mastodons, the nearly allied genera, called Tetro- 

 caulodon and Anthracotherium. 



We place next to the Froboscidens, the Pachy- 

 derms, with four tusk-like lower incisors. 



Genus HIPPOPOTAMUS, or River Horse, is pre- 

 eminently aquatic ; having the head so shaped that 

 the nostrils, eyes, and ears, can be protruded above 

 the surface without showing any other part of the 

 animal. For description of the living species we 

 refer to Volume Fifth as before, where the probability 

 of the Cape species, H. Capensis, being different 

 from the Senegal, H. Senegalensis, is discussed; and 

 the three known fossil, H. major, H. medius, and 

 H. minor, are likewise named. 



In the next group the incisors vary, some having 

 four in each jaw, and others none in either ; but all 

 have three toes on all the feet. 



Genus RHINOCEROS, containing the living species 



of R. Indicus, R. Sumatranus, R. Sondaicus of 



Tenasserim and Indian Islands, and R. Africanus, 



and R. Simus, are described in Volume Fifth ; and 



R. Keitloa. The White Rhinoceros, another 



