All this alluvium was evidently of fluviatile origin, for, in the interstices between the pebbles, the ancylus fluviatilis and other freshwater shells were abundant.
"The Antiquity of Man"
Charles Lyell
ancylus 14 Europe, N. and S. America-in ponds, rivers, lakes, etc.
"Sea-Weeds, Shells and Fossils"
Peter Gray B. B. Woodward
There is a reference to a Figure 24 for ancylus; but no Fig.
"Sea-Weeds, Shells and Fossils"
Peter Gray B. B. Woodward