Lyonsia, [II.] 4.

Mactra, [III.] 21-26.

Mangelia, [XIX.] 4-26.

Margarita, [XI.] 21-24.

Marginella, Erato.

Megathyris, Argiope.

Modiola, [VII.] 6-11.

Montacuta, [VI.] 1-3.

Murex, [XVIII.] 3, 4.

Mya, [I.] 19-20.