218 RODENTIA. 
4 the enamel-folds obliterated at an earlier stage of wear. The cranium 
yt presents well-marked differences from Castor. 
} 

Chalicomys eseri, H. v. Meyer’. 
Syn. Chloromys, H. v. Meyer”. 
Steneofiber esert, Pomel3, 
Steneofiber viciacensis, P. Gervais‘. 
Steneofiber noulett, Pomel5 (7 parte P). 
Steneofiber castorinus, Pomel 6. 
The authority for most of the synonymy is that of Filhol, in the 
Ann. Sci. Géol. vol. x. art. 3, p. 44 (1879). The species is a diffi- 
cult one to define, as there seems a great amount of variation in the 
size of the teeth of different specimens, which appear, however, to 
pass so gradually into one another as to forbid their poe 
separation. 
Hab. Kurope. 
26707. Anterior portion of the right ramus of the mandible, con- 
taining the canine and the first three cheek-teeth ; from 
the Lower Miocene of St. Gérand-le-Puy (Allier), France. 
This specimen agrees very well in relative size with the 
cranium figured by P. Gervais in the Zool. et Pal. Fran- 
gaises, 2nd ed. pl. xlvii. fig. 9a, and is of very nearly 
the same size as the mandible figured by Filhol in the 
Ann. Sci. Géol. vol. x. pl. v. fig. 3; the length of the 
space occupied by the first three cheek-teeth is, however, 
somewhat less. Pomel Collection. Purchased, 1851. 
26708. Articular portion of the left ramus of the mandible; from 
| the Lower Miocene of St. Gérand-le-Puy. 
| Pomel Collection. Purchased, 1851. 
40897. The greater part of the left ramus of the mandible, showing 
all the teeth ; from the Lower Miocene of Aller. The 
premolar is smaller than in No. 26707, but the true molars 
are of the same size. Presented by C. Falconer, Ksq., 1867. 
1 Neues Jahrb. 1846, p. 474. (The species is often quoted as Neues Jahrb. 
1838, p. 414; 1843, p. 390; but these are incorrect: the names éser? and cas- 
torinus were applied in the same year.) 
2 Ibid. 1848, p. 390. 
3 Catalogue Méthodique, p. 21 (1853) ; errortm, eschart. 
4 Zool. et Pal. Frangaises, Ist ed. vol. i. p. 22 (1848-52), 
5 Catalogue Méthodique, p. 24 (1853). 
6 Bull. Soc. Géol. France, ser. 2, vol. iv. p. 885 (1846). 
