434 ANOPLOTHERIUM. 



the crown, very characteristic of the genus, and such a 

 tooth in a perfect state (fig. 176) has been discovered in 

 the eocene freshwater deposits at Binstead in the Isle of 

 Wight. 



The first premolar chiefly differs in the increased thick- 

 ness and greater development of the basal ridge ; which, 

 in the three larger succeeding premolars, assumes the 



Fig. 176. Fig. 177. 



Upper canine, nat. size. Anoplotherium First upper premolar, nat size. Ano- 

 commune. plotherium secundarium. Seafield, 



Isle of Wight. 



character of an inner lobe, and a second lower ridge is 

 developed. When the crown of the anterior premolar is 

 much worn, the enamel lining the valley between it and 

 the basal ridge forms an island, as in the tooth the grinding 

 surface of which is figured in cut 177. This tooth, which 

 is from the freshwater deposits at Seafield quarry, Isle of 

 Wight, indicates by its size the smaller species of Anoplo- 

 there, which Cuvier has called An. secundarium. 



The true molars are three in number, on each side 

 of both jaws of the Anoplotherium : those above have large 

 square crowns (fig. 1 78) divided into an outer and an inner 

 lobe by a valley, 5, extending from the inner side, two- 

 thirds across, contracting as it penetrates. A second valley 

 crosses its termination at right angles, and forms a curved 



