162 UNOULATA. 



Genus CHALICOTHEKIUM, Kaup 1 . 



Including : Anisodon, Lartet 2 . 



Nestoritherium, Kaup 3 . 



Dentition: I. g=JJ, C. ( ^, Pm. f, M. |. The two hinder cusps 

 of the upper true molars are connected by a transverse ridge in the 

 Old- World forms, although this may be very faint (e. g. C. sivalense*). 

 In the closely allied North-American forms named Palceosyops, 

 Leidy 5 , and Limnohyus, Marsh, there are four premolars and the 

 cross-ridges are absent ; but as variations of at least equal import- 

 ance occur in the upper molars of the different species of Rhinoceros, 

 the writer is by no means assured of the advisability of their generic 

 separation. 



Chalicotherium goldfussi, Kaup 6 . 



Syn. Chalicotherium antiquum, Kaup 7 . 

 Chalicotherium yrande, Gervais 8 . 

 Anisodon maynus, Lartet 9 . 



This is the type species, and is of large size ; incisors and canines 

 were present in both jaws. As it is difficult to draw any distinction 

 between the type form and the smaller so-called C. antiquum, all 

 the specimens are provisionally referred to one species. 



Hab. Europe. 



M. 2713. Cast of the third left upper true molar. The original is 

 from the Upper Miocene of Eppelsheim, Hessen-Darmstadt, 

 and is preserved in the Darmstadt Museum ; it is the 

 type, and is figured (reversed) by Kaup in the Oss. Foss. 

 d. Darmstadt, pt. 2, pi. vii. fig. 3. 



Egerton Collection. Purchased, 1882. 



M. 2714. Cast of the second right upper true molar. The original 

 is from Eppelsheim. 



Egerton Collection. Purchased, 1882. 



1 Oss. Foss. d. Darmstadt, pt. 2, p. 4 (1833). 



2 Notice sur la Colline de Sansan, p. 30 (1851). 



3 Beitrage, pt. 4, p. 3 (1859). 



4 Cope, op. tit., says that there is no transverse ridge in this species, for 

 which he retains the name Nestoritherium. 



5 See ' Extinct Vert. Fauna, Western Territories' (Eep. U.S. Geol. Surv.), 

 pi. iv. 



6 Oss. FOBS. d. Darmstadt, pt. 2, p. 4 (1833). 



7 Ibid. p. 6. 



8 Zool. et Pal. Fran9aises, 1st ed. vol. i. p. 91 (1849-52). 



9 Notice sur la Colline de Sansan, p. 30 (1851). 



