COMMON ANOPLOTHERE. 435 



depression in each lobe, a b f , concave towards the outer side 

 of the crown, this side being im- 

 pressed by two parallel excava- 

 tions, d d. The peculiar characte- 

 ristic of the upper molar of the 

 Anoplothere and that by which it 

 may be most readily distinguished 

 from a molar of the Paleotherium, 

 is the large conical tubercle m at 



,i ! ,i 11 i Upper molar, nat. size, of Ano- 



the wide entry of the valley b. ^ plotlierium commune . B in- 



The two points of the outer con- stead, Isle of Wight, 

 tinuous border of the two lobes are first abraded; a 

 double crescentic field of dentine is next exposed, with 

 a detached island on the summit of the internal cone : 

 this, afterwards, from the minor depth of the valley in 

 front of its base, becomes blended with the anterior lobe, b', 

 from which also the crescentic enamel fold is first oblite- 

 rated, and the pattern of the grinding- surface, which at 

 first resembled that of the Ruminant, is reduced to that 

 of the Palseothere (fig. 110) and Rhinoceros (fig. 122).* 



The lower incisors and canines much resemble those 

 above. The molar series here, also, consists of four pre- 

 molars and three true molars ; to the latter belongs the 

 tooth discovered by Mr. Thomas Allan of Edinburgh, in 

 the lower freshwater limestone quarry at Binstead, which 

 is figured by Dr. Bucldand, in the ' Annals of Philosophy,' 

 vol. x. (1825), p. 361, in a brief memoir containing the 

 first announcement of the remains of the peculiar extinct 

 Pachyderms of the Paris basin in the analogous basin of 

 eocene freshwater deposits in Hampshire. The tooth 



* The three principal stages of attrition are well displayed in the fossil upper 

 jaw of the Anoploikerium commune from the Montmartre gypsum, figured by 

 Cuvier in the ' Ossemens Fossiles,' 4to., 1822, torn. iii. pi. xlvi. fig. 2. 



F F 2 



