332 PALAEONTOLOGY 



oblique fissure (e), continued from near the middle oi' the inner 

 surface of the crown obliquely across two-thirds of the tooth. 

 Each division is subdivided partially into an outer (ab) and 

 an inner (cd) lobes ; the anterior division, by the terminal 

 expansion (i) of the fissure (e), the posterior one by the fissure 

 (ar). The lobes (c and d) are bordered near their base by a 

 ridge. This is the type of grinding surface, on which are 

 superinduced the modifications of that surface in the upper 

 molars of the rhinoceros and horse. The dental formula of 

 Palceotherium is i .^^ c j^, p ^- 4 , m gE3=44. The canines 

 exceed in length the other teeth, and there are consequently 

 vacancies in the dental series for the lodgment of the crowns 

 of the canines when the mouth is shut. 



Genus Anoplotherium, Cuv. — With the same dental for- 

 mula as in Palceotherium, the present genus, like Dichochn (fig. 

 102) has no interval in the series of teeth ; neither the canine 

 nor any other tooth rising above the general level. The grind- 

 ing surface of the molar teeth somewhat 

 resembles and prefigures the ruminant 

 type ; in the upper jaw the crown (fig. 

 100) is divided into a front (fc) and a 

 back (fd) lobe by a valley (e) extending 

 two thirds across. A second valley (gi) 



crosses its termination at right angles, 

 a 100. 6 fo 



Upper molar, Anophthe- forming a curved depression in each 

 Hum commune (Eocene division, which it thus subdivides into 

 yps '' two lobes, concave towards the outer 



side of the tooth. There is a large tubercle (m) at the wide 

 entry of the valley (e). The Anoplothere (fig. 101) was of a 

 lighter and more elegant form than the Falseothere : its limbs 

 terminated each in two digits, with the metapodial bones 

 distinct, and the last phalanx hoofed. Some transitory cha- 

 racters of the embryo ruminant were retained throughout life 

 by the Anoplothere. The species restored in tig. 101 was about 



