A^THRACOTHERIID.^. 



233 



30341, 30344. Three terminal phalangeals provisionally referred 

 to the present genus. 



Hastings Collection. Purchased, 185v5. 



30051. The broken atlas vertebra of a large form. The form of 

 the cavity for the reception of the odontoid process of the 

 axis shows that this must have been peg-shaped, as in the 

 present family. The facets for articulation with the 

 centrum of the axis seem, however, to be placed in a plane 

 too nearly transverse to the long axis of the bone for the 

 specimen to have belonged to the same species as the axis 

 vertebra noticed below. 



Hastings Collection. Purchased, 1855. 



29960. The centrum of the axis vertebra of a large form (? H. bo- 

 vinus). Hastings Collection. Purchased, 1855. 



29960 a. The centrum of the axis vertebra of a smaller form. 



Hastings Collection. Purchased, 1855. 



30074. A dorsal vertebra of a large form. 



Hastings Collection. Purchased, 1855. 



30169. The first sacral vertebra of a large form. 



Hastings Collection. Purchased, 1855. 



Hyopotamus picteti, Lydekker \ 

 Syn. Hyopotamus gresslyi, Pictet 2 . 



The upper true molar of this small species precisely resembles those 

 of the much larger H. porcinus ; the penultimate upper premolar is 

 of a narrow elongated type, approaching that of Xiphodon. The 

 type maxilla is figured by Pictet (loc. cit.) under the name of 

 Hyopotamus gresslyi (Meyer) ; but its distinction from that species 

 has been indicated by the present writer (loc. cit.). 



Hob. Switzerland. 



M. 2184. Three detached upper true molars ; from the Upper Eocene 

 (Bohnerz) of Switzerland. These teeth agree precisely 

 with those of the type specimen figured by Pictet. The 

 deep concavity of the outer surface of the external 

 columns, and the marked loop connecting those columns, 



1 Geol. Mag. dec. 3, vol. ii. p. 131 (1885). 



2 Materiaux pour la Paleontologie Suisse, vol. i. Vertebres de la Faune 

 Eocene, Supplement, pi. xxiv. fig. 5 (18C>9). 



