shell sac
English
Noun
shell sac (plural shell sacs)
- (zoology) The sac in which the shell of a mollusc is secreted during development; (now especially) the fold of mantle in which a cephalopod secretes its pen or gladius.
- 2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 115:
- Baby cephalopods, even octopuses, all have a shell sac, which is comparable to the mantle folds that baby clams and snails use to make their shells.