Also known as Giant Sea Snail, North Atlantic Whelk, True Whelk, Whelk.
Found on intertidal creeks and reef flats fringed by subtidal channels and oyster reefs.
They feed on clams, oysters and scallops.
Length - 30cm
Depth - 0-50m
Widespread Western Atlantic, Eastern Pacific
These shells are spindle shaped in an elongated spire.
They are also carnivores using the lip of its shell, synchronous with its foot, to penetrate, break off and force open the valves of its prey. Ref: https://en.wikipedia.org/wiki/Knobbed_whelk