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

by Sir Charles Lyell

Fig. 44.

Cerithium cinctum. Paris basin.

A few genera, among which Cerithium ([fig. 44.]) is the most abundant, are common both to rivers and the sea, having species peculiar to each. Other genera, like Auricula ([fig. 38.]), are amphibious, frequenting marshes, especially near the sea.

Fig. 45.

Helix Turonensis. Faluns, Touraine.