216 RODENTIA. 
41450. The right innominate ; from the turbary of the Lea valley, 
near Walthamstow. Purchased, 1869. 
39468 a. The scapula, the humerus, radius, and ulna of a young indi- 
vidual; from the Fens of Lincolnshire. Purchased, 1865. 
Genus TROGONTHERIUM,, Fischer’. 
Syn. (P) Deobroticus, Pomel?. 
Mistory.—The genus Trogontherium was originally described by 
Fischer on the evidence of a cranium from the Pleistocene of 
Siberia. Remains of a large Rodent from the Pleistocene of 
England and France were subsequently referred by Owen® to the 
Same genus and species. P. Gervais* came, however, to the con- 
clusion that both the English and French specimens were generically 
distinct from Fischer’s specimen, and adopted for them -Pomel’s 
name of Drobroticus. This view is followed by Alston’ and Flower’ ; 
but E. T.-Newton” comes to the conclusion that Owen’s view is 
correct, alleging that the difference between Fischer’s specimen and 
the English and French form is merely due to differences in the 
degree of wearof the cheek-teeth. As this view has not been dis- 
proved, it is provisionally adopted here. 
Trogontherium cuvieri, Fischer’. 
Syn. (?) Diobroticus sehmerlingt, Pomel’. 
Castor trogontherium, Cuvier". 
Hab. Kurope. 
M. 472. Cast of the cranium, wanting the zygomatic arches and the 
nasals. The original, which is Fischer’s type specimen, 
was obtained from the Pleistocene of Siberia, and is pre- 
served in the Museum at Moscow. 
Presented by the Moscow University. 
1 Mém. Soe. Imp. Nat. Mose. vol. ii. p. 260 (1809). 
2 Arch. Sci. Phys. Nat. vol. ix. p. 167 (1848). 
3 Catalogue Foss. Rem. of Mammalia and Aves in Mus. Roy. Coll. Surgeons, 
p. 35 (1845) ; British Foss. Mammals and Birds, p. 184 (1846); Geol. Mag. 
vol. vi. p. 49 (1869). 
4 Zool. et Pal. Générales, 1st ser. p. 81 (1867-69). 
5 Proc. Zool. Soc. 1876, p. 78. 
® Catalogue of Mammalia in Mus. Roy. Coll. Surg. p. 602 (1884). 
7 Geol. Mag. dee. 2, vol. viii. p. 256 (1881). 
8 Loc. cit. 8 Locwait. 
10 Ossemens Fossiles, Ist ed. vol. v. pt. 1. p. 59 (1828). The specific name 
trogontherium has the priority over cwviert; but the former has been so gene- 
rally used in a generic sense that it seems best to retain the latter. 

