CHALICOTIIEEIUM SIVALENSE. 



219 



hibit a vestige of the basal ' bourrelet,' or collar, wliicb is so 

 constantly found upon the teeth of Palceotherium. The tren- 

 chant edge of each lobe, after forming the small outer point, 

 is bent round to the inner side, so as to form a compressed 

 curve, which wears down to a crescentic pattern. There are 

 two peculiarities connected with these edges which requ.ire 

 special notice. The anterior edge of the front lobe descends 

 uniformly and obliquely forwards, from the outer point to a 

 low termination at the inner side, whence it shelves a shoi-t 

 way backwards to join on vrith the base of the internal middle 

 eminence, as occurs in the lower molars of Macrauchenia 

 Patagonica, while its posterior edge and both edges of the 

 rear lobe bend in a concave line across, to terminate each in 

 a small elevated point at the inside ; so that the posterior 

 lobe has two inner points, while the anterior lobe has only one. 

 This is precisely the reverse of what takes place in Anoflo- 

 therium, in which the anterior lobe has two internal points, 

 while the rear lobe has only one. Further, the angle of 

 junction of the two crescents forms a double or bifid point, 

 as in the Palceotherium of Montpellier (P. Aurelianense) 

 whereas in the other Palceotheria and in Anoflotlierivmi it 

 is always simple. This character was specially noticed by 

 M. Laurillard, in comparing the fragment with lower jaws 

 of Palceotherium, in the Paris Museum.^ This bifid point is 

 seen in Plate XVII. figs. 6 and 7 ; it is also exhibited by the 

 first and second true molars of the Dadoopoor lower jaw, a 

 A^ertical furrow indicating the line of division. The penulti- 

 mate molar (m. 2) shows a weU-marked posterior talon ridge, 

 which commencing at the base of the posterior inner point is 

 directed downwards and across to terminate at the base of 

 the outer surface of the posterior crescent : thus reversing 

 what is presented by the anterior edge of the front lobe. This 

 talon is feebly developed on the first true molar (m. 1), and 

 is entirely wanting to the last premolar (p.m. 3), being the 

 only character by which the latter is distinguished from the 

 true molars. Direct evidence as to the form of this talon in 

 the last molar (m. 3) is wanting, in consequence of the fracture 

 in the specimen of the posterior lobe ; but enough of the out- 

 line remains to show that this tooth was devoid of the third 

 lobe or crescent, which is constantly foimd in all the species 

 of Anoplotherium and Palceotherium. This is a character of 

 generic importance in which Chalicotherium Sivalense agrees 



' ' Cette maeliolre semble tenir des 

 Palseotlieriums, des Anoplotheriums et 

 des Ehinoceros. Les dents ont la forme 

 generals de celles des Palseotheriums et 

 surtoiit de celles du Palseotli. de Mont- 



pellier, puisque, Tangle de reunion des 

 deux croissans est double, ou forme deux 

 points en regardant les dents par la face 

 interne,' &c. — (MSS. Com. from M. Lau- 

 rillard.) 



