or St. Lucar, a port-town of Mexico, situated on a bay of the South Sea, in 88° W. long. and 10° 15' N. lat.

NICITATING MEMBRANE, a thin membrane, chiefly found in the bird and fish kind, which covers the eyes of these animals, sheltering them from the dust or too much light; yet is so thin and pellucid, that they can see pretty well through it.