See text Caecum is a genus of minute sea snails, marine gastropod micromolluscs or micromollusks in the family Caecidae or blind shells.

Many species live in sponges, in sandy spots on reefs, or in grassy beds in shallow waters in bays and lagoons.

Many species are considered to be uncommon, but this assessment may be a result of lack of proper sampling.

The sculpture is smooth or consists of a close-set, large number of annular ridges.

These snails feed on one-celled organisms on sand grains or pebbles.