whelk

As he grows he needs a larger house, and so leaves the tight shell and pops his tail into a bigger one, generally a whelk shell.

Some of them would swallow the whelk shell, crab and all, but they would not eat one on which an Anemone was fixed.

The Whelk, however, is a clever burglar; he knows how to make a way into the hardest of shelly houses.

Now we will look at a shell-builder, the Whelk, who uses his flinty tongue in quite another fashion.

The whelk and his cousins know how to bore a hole in the shell, and suck out the helpless Oyster.