30 
river-drift and the subjacent rocks, in the positions shown 
by a -f- in the following imaginary section across a valley. 
Fig. 1. 
10. The following, amongst many varieties, are the two prin¬ 
cipal types which have been found in Europe, in the drift-gravels, 
associated with the remains of elephant, rhinoceros, hippo¬ 
potamus, and other extinct animals: these illustrations are 
contributed by John Evans, Esq., F.R.S. 
Fig. 2. 
TONGUE-SHAPED. 
