CORYPHODON EOC^ENUS. 301 



The large extinct tapiroid Pachyderms have left their 

 remains on the continent in both miocene and eocene form- 

 ations : in England they are represented by scanty but 

 extremely interesting fossils, which have been obtained 

 from the eocene deposits of the London and plastic 

 clays. 



If the specimen, fig. 103, which is a fragment of the 

 right branch of the lower jaw, containing the last and 

 part of the penultimate molar teeth, be compared with 

 the figures which Cuvier has given of the corresponding 

 parts of the Lophiodon Isselanus, (Grand Lophiodon d'lssel, 

 * Ossemens Fossiles,' 4to, 1822, Tapiroids, pi. iii, fig. 3,) 

 or of the LopModon medius, (loc. cit. fig. 1,) their family 

 likeness will be readily appreciated ; but the jaw-bone 

 below the last tooth in the English fossil is deeper in 

 proportion to the size of that tooth, than in the LopModon 

 Isselanus, and still more so than in the Loph. medius 

 which differs by its more slender jaw from the Loph. Is- 

 selanus. But the more important discrepancies which 

 determine the sub-generic distinction of the large extinct 

 tapiroid lophiodont Pachyderm of our eocene clay, are 



Fig. 104. 



Last molar and part of penultimate molar of Coryphodon eocaenus. 

 Upper and outer view ; nat. size. Essex coast. 



