PACHYDERMATA. 269 



But we arrange their classification somewhat in a 

 contrary order, taking, for leading genus, that which, 

 though extinct, is admitted by physiologists as in- 

 termediate between herbivorous cetacea and pachy- 

 dermata, some referring it to the former, on the 

 supposition that it was not provided with hinder 

 extremities, others as most nearly allied to Tapirus, 

 in consequence of the conformity of their teeth. We 

 include it in 



The Proboscidean pachydermata. Genus DINO- 

 THERIUM. With tusks projecting from the chin, 

 and turned downwards in the shape of hooks. Of 

 two species indicated, 



Dinoth. giganteum was the largest terrestrial ani- 

 mal known, being computed to have measured 18 

 feet in length. 



Here also may be placed other imperfectly known 

 fossil genera, such as Chalicotherium, two species; 

 Lophicodon, containing no less than fifteen species ; 

 Paleotherium, eleven or twelve species, beside seve- 

 ral of 



Tapirus, among which one nearly equal in stature 

 to the elephant. For the existing species of Asia 

 and America, vide Volume Fifth of the Mammalia, 

 already referred to. All these have a proboscis more 

 or less lengthened ; three visible toes of the hind 

 feet, and lacustrine habits. 



In the next group we have the true Probosci- 

 deans, with tusks, whereof the extinct genera had 

 still the same predilection for water ; and even the 

 existing species of elephant evidently delight in it. 



