In addition to tentacles, there may be marginal cirri (Laodice) with a solid endodermal axis, spirally coiled, very contractile, and bearing a terminal battery of nematocysts.
Gibbula, with jaws, three pairs of epipodial cirri without pigment spots at their bases, British.
Margarita, five to seven pairs of epipodial cirri with a pigment spot at base of each.
(A portion of the fringe of cirri is removed to show the brachial membrane and a portion of the spiral extremities of the arms.) FIG.
The cirri or tentacles, of which three or four pairs are present, are capable of being protruded, and the minute larva swims by means of the ciliary action they produce.
The vestibule of the mouth is the space bounded by the oral hood; this arises by secondary downgrowth of lid-like folds over the true oral aperture, and is provided with a fringe of tentacular cirri, each of which is supported by a solid skeletal axis.
The oral hood with its cirri has a special nerve supply and musculature by which the cirri can be either spread out, or bent inwards so that those of one side may interdigitate with those of the other, thus completely closing the entrance to the mouth.
- A, Balanus (young), side rami are multiarticulate view with cirri protruded.
(Morse.) of the shell these " cirri " are spread out to form a casting-net for the capture of minute floating prey.
With cirri extended.