\Pal"li*al\, a. [L. pallium a mantle. See {Pall}.]
(Zo["o]l.)
Of or pretaining to a mantle, especially to the mantle of
mollusks; produced by the mantle; as, the pallial line, or
impression, which marks the attachment of the mantle on the
inner surface of a bivalve shell. See Illust. of {Bivalve}.
{Pallial chamber} (Zo["o]l.), the cavity inclosed by the
   mantle.
{Pallial sinus} (Zo["o]l.), an inward bending of the pallial
   line, near the posterior end of certain bivalve shells, to
   receive the siphon. See Illust. of {Bivalve}.