A Manual of Conchology / According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.

by Thomas Wyatt

Margin, the whole circumference or outline of the shell in bivalves.

Marginated, having a prominent margin or border.

Membrane, a web of several sorts of fibres.

Membranaceous, consisting of membranes.

Mottled, clouded or spotted with various colours.

Mucronate, ending in a sharp rigid point.

Multilocular, many-chambered, consisting of several divisions.

Muricated, clothed with sharp spines.

N.

Nacred, pearly, pearlaceous.