One of the best examples of the introversible mouth-cylinder or proboscis which can be found is that of the common whelk (Buccinum undatum) and its immediate allies.
White wampum was made from the shell of whelks, either from the common whelk (Buccinum undatum), or from that of Pyrula canaliculata and Pyrula carica.
- Colony of Hydractinia echinata, growthemselves; or, ing on the Shell of a Whelk.
Oysters do not flourish in water containing less than 3% salt; and hence they are absent from the Baltic. The chief enemies of oysters are the dog-whelk, Purpura lapillus, and the whelk-tingle, Murex erinaceus, which bore through the shells.