Monotrypasta (= Osculosa), [76]

Monoxenia darwinii, [342]

Monstrous Foraminiferal shells, possible formation of, [69]

Montipora, [390], [396]

Moore, [293]

Mopsea, [353]

Morgan, on regeneration, [35] n.

Morphological contrast of Animals and Plants, [38] f.

Mortensen, on classificatory value of pedicellariae, [532];

on classification of Cidaridae, [534];