Definitions for "Pallial line"
a linear impression on the inner surface of the shell, parallel to the ventral margin, the line of attachment of the mantle muscles.
a single-line impression on the inner surface of the valve parallel to the outer margin, marking the attachment of the muscular edge of the mantle.
Impression or scar on the inner surface of a bivalve shell, parallel to the ventral edge, by the insertion of the muscles that attach the mantle to the shell. See also Mantle scar.