Biatas, ii. [104]

Bibos, ii. [222]

Bison, ii. [222], [225]

Binney, Mr., on Air-breathing Molluscs of N. America, ii. [528]

Birds, means of dispersal of, i. 15

dispersal of by winds, i. 16

American, found in Europe, i. 16

reaching the Azores, i. 17

barriers to dispersal of, i. 17

limited by forests, i. 17