190 CASTORID A. 
RODENTIA. CASTORIDL. 
Fig. 74. 
= nat. size. Fens, Cambridgeshire. 
CASTOR EUROPZEUS. European Beaver. 
Castor des tourbiéres, Cuvisr, Ossem. Fossiles, v. pt. 1. p. 55. 
Castor fossilis, Gotpruss, Nova Acta Acad. Nat. Cur. tom. xi. pt. 2. 
p- 488. 
Trogontherium Werneri, Fiscuer, Mémoires de la Société des Naturalistes 
de Moscou, tom, ii. p. 250. 
Tuar the present European Beaver is not the degenerate 
descendant of the great Trogontherium, is proved, not only 
by the differences in the dental structure pointed out in 
the preceding section, but likewise by the fact that Beavers, 
in no respect differing in size or anatomical characters from 
