of the Neotropical region, ii. [19]
of the Antilles, ii. [75]
conditions favouring development of, ii. [75]
of N. America, ii. [124]
general observations on the distribution of, ii. [522]
richness of islands in, ii. [525]
their mode of diffusion, ii. [525], [528]
comparative distribution of Operculate and In-operculate, ii. [526]
estimated numbers of, ii. [526]
Land-snakes, ii. [382]