Margarornis, [484]

Marmaronetta, [111];

M. angustirostris, [123]

Marsh, restoration of Hesperornis, [46];

head of Ichthyornis, [48];

on Laopteryx, [25] n.;

on Odontornithes, [45], [49] n.

Martin, [522]-[525];

Sand-, [524], [525]

Martineta, [185]