722 MANUAL OF ZOOLOGY. 



by the genus Lophiodon. (Coryphodon, which has generally 

 been placed here, has been shown by Marsh to have five toes 

 to both feet, and it, therefore, forms the type of a special 

 family of Perissodactyles.) The genus Tapirns itself begins in 

 the Miocene. 



The Brontotheridcz are wholly extinct, and are confined to 

 the Miocene of North America. 



The Palaotherida are likewise completely extinct, and are 

 confined to the Eocene and Miocene. 



The Macrauchenidce. are confined to the Pliocene and Post- 

 pliocene of South America. 



The distribution of the Equidce in time has already been 

 spoken of (see p. 702). The oldest genus of the family is the 

 Eohippus of the American Eocene. 



Amongst the Artiodactyles, the earliest representative of the 

 HippopotamidcR is the Hexaprotodon of the Upper Miocene 

 (Pliocene?) of India, which differs from Hippopotamus proper 

 only in having six lower incisors, in place of four. The latter 

 genus appears in Europe in the Pliocene. 



A very large number of fossil forms of Suida are known 

 from the Tertiaries of both the Old and New Worlds, beginning 

 in the Eocene (Chceropotamus, &c.) 



The Oreodontidce are wholly confined to North America, and 

 belong to the Miocene and Pliocene. 



The Anoplotherida are wholly extinct, and are confined to 

 the Eocene and Miocene periods. 



The CamelidcB are first represented in the Miocene deposits 

 of North America (Poebrotherium, &c.), and the later Tertiaries 

 and Post-tertiaries of the same country have yielded several 

 other extinct types of this family. Fossil remains of Camelida. 

 also occur in the Upper Miocene (Pliocene?) of India; and early 

 types of the Llamas occur in the Pliocene of South America. 



The Tragulida are first known to have come into existence 

 during the Miocene period (Amphitragulus and Dremotherium) , 

 but it is possible that some Eocene types (Xiphodon and Caino- 

 therium] are really referable here. 



The Ceruida appear for the first time in the Miocene (Dorca- 

 therium, Dicrocerus, &c.) Cervus itself appears in the Upper 

 Miocene, and of the same age is the genus Amphimoschus, re- 

 lated to the living Musk-deer. 



The first representative of the Camelopardalidce, so far as 

 known, is the Helladotherium of the Upper Miocene of France, 

 Greece, and India. 



The Antilopida appear in forms closely allied to recent ones 

 in the Miocene of Europe ; and in beds of Upper Miocene 



