—— eating seeds, [362], [387].
——, fresh-water, distribution of, [384].
Fishes, ganoid, now confined to fresh water, [107].
——, electric organs of, [192].
——, ganoid, living in fresh water, [321].
—— of southern hemisphere, [376].
Flight, powers of, how acquired, [182].
Flowers, structure of, in relation to crossing, [97].
—— of compositæ and umbelliferæ, [144].
Forbes, E., on colours of shells, [132].