A Manual of Elementary Geology / or, The Ancient Changes of the Earth and its Inhabitants as Illustrated by Geological Monuments

by Sir Charles Lyell

Lymnea longiscata; fossil. Hants.

Fig. 33.

Paludina lenta; fossil. Hants.

The univalve shells most characteristic of freshwater deposits are, Planorbis, Lymnea, and Paludina. (See figures.) But to these are occasionally added Physa, Succinea, Ancylus, Valvata, Melanopsis, Melania, and Neritina. (See figures.)

Fig. 34.