TROGONTHERIUM CUVIERI. 189 
and structure of the teeth of the Trogontherium, will, I trust, 
be allowed to yield the same grounds for its sub-generic 
distinction, as have been proposed or accepted by the best 
modern Zoologists for the subdivisions of the same value 
in the rest of the Rodent Order. 
Portion of the lower jaw of the Trogoutherium, shewing the grinding surface 
of the teeth. Nat. size. Cromer. 
