184 CASTORID.&. 
RODENTIA. CASTORIDM. 
Fig. 71. 
Lower jaw, 3} nat. size. Bacton. 
TROGONTHERIUM CUVIERI. Cuvier’s Gigantic 
Beaver. 
Trogontherium Cuvieri, FiscuER, Mémoires de la Société des Naturalistes de 
Moscou, tom. 11. p, 250. 
Castor trogontherium, Cuvier, Ossemens Fossiles, tom. v. pt. 1. p. 59. 
Tue discovery of the remains of a Rodent animal indi- 
cating an extinct sub-generic type in that order, and a 
species nearly allied to, but much exceeding in size the 
Beaver, which is now the largest of the indigenous Rodents 
of Europe, is due to M. Gothelf de Fischer, who has thus 
interpreted the characters of a fossil cranium from the sandy 
borders of the Sea of Azof. 
Cuvier, to whom M. Fischer had transmitted a figure of 
this fossil, perceived its close resemblance to that of the 
Beaver, but observed, that it was about one-fifth larger 
