ADDENDUM. 263 
30346 a. Seven upper true molars, one upper premolar, and two 
lower true molars ; from the Headon beds (Upper Eocene) 
of Hordwell, Hampshire. Some of these teeth, as well 
as those of the succeeding specimens, are slightly larger 
than any of those noticed by Filhol in the Ann. Sci. Géol. 
vol, vill. art. 1, pp. 87-103. 
Hastings Oollection. Purchased, 1855. 
29741. Part of the right ramus of the mandible, containing the 
canine and four cheek-teeth; from the Headon beds of 
Hordwell. Hastings Collection. Purchased, 1855. 
30323. Fragment of the right ramus of the mandible, with the 
three true molars; from the Headon beds of Hordwell. 
Hastings Collection. Purchased, 1855. 
' $0856. Fragment of the right ramus of the mandible, with m. 2 and 
m. 3; from the Headon beds of Hordwell. 
Hastings Collection. Purchased, 1855. 
29864. Fragment of the right ramus of the mandible, with pm. 4 
and m. 1; from the Headon beds of Hordwell. 
Hastings Collection. Purchased, 1855. 
Order RODENTIA. 
Genus CASTOR (page 216). 
Castor canadensis, Kuhl’. 
Hab. North America. 
M. 1958. Part of the left ramus of the mandible, with the first 
three cheek-teeth ; from the Pleistocene of Owyhee, Rocky 
Mountains. Presented by Sir R. Owen, K.C.B., 1884. 
* Beitrage z. Zoologie, p. 64 (1820). 
