Affinities: of extinct species, 329.
Archiac, M. de, on the succession of species, 325.
Chthamalus, cretacean species of, 304.
Alpine species suddenly becoming rare, 175.
Fries on species in large genera being closely allied to other species, 57.
Modification of species, how far applicable, 483.
Naturalisation: of forms distinct from the indigenous species, 115.
American, two species of, 349.
Philippi on tertiary species in Sicily, 312.
Pictet, Professor: on groups of species suddenly appearing, 302, 305.