554 HISTORICAL PALEONTOLOGY. 



other hand, belong in great part to extinct types, and are 

 sufficiently remarkable in their characters to demand some 

 notice. In addition to the orders known to be represented in 

 the Eocene Tertiary, we meet now with remains referable to 

 the Edentata, Proboscidea, and Quadrumana ; whilst some 

 existing groups of the older orders are now represented for the 

 first time. 



The Edentates are represented by the gigantic Macrotherium, 

 which appears to have been nearly allied to the Scaly Ant- 

 eaters or Pangolins, and by the still more gigantic Ancylotherium. 



Of the Sirenia we have the genus Halitherium, and of the 

 true Cetacea we have the remains of Squalodonts and Dolphins. 



Of the Ungulates the Rhinocerida are represented in Miocene 

 times by Acerotherium, the Equida by Anchitherium and Hip- 

 parion, the Hippopotamidce by species of Hippopotamus itself, 

 the Suida by species of Sus, the Moschida by Dremotherium, 

 the Cervidce by Dorcatherium, the Camelopardalida by Hellado- 

 therium, and the Cavicornia by the extraordinary SwatJierium 

 and Bramatherium. The Bovidcs do not appear as yet to 

 have come into existence. 



The Proboscidea are represented in the Miocene period by 

 all the known sections of the order namely, by Elephants, 

 Mastodons, and the Deinotherium. 



Of the Carnnora we have Miocene representatives of the 

 Felidce {Machairodus\ the Canidce, Hycenida, Viverridce, and 

 Mustelida. The Insectivora are represented by species of 

 Erinaceus and Talpa, and the Rodents by species of Castor, 

 Mus, Lepus, &c. Lastly, the Quadrumana are represented by 

 the two extinct genera Pliopithecus and Dryopithecus. 



CHAPTER LVI. 



PLIOCENE AND POST-PLIOCENE PERIODS. 

 ROCKS OF THE PLIOCENE PERIOD. 



THE Pliocene formations contain from 40 to 95 per cent of 

 existing species of Mollusca, the remainder belonging to extinct 

 species. They are divided by Sir Charles Lyell into two 

 divisions, the Older Pliocene and Newer Pliocene. 



The Pliocene deposits of Britain occur in Suffolk, and are 

 known by the name of " Crags," this being a local term used 



