Vertebrata, late origin of reproductive cells in, [74].

Vespa, [53].

Viola calcarata, fertilization of, [310];

tricolor, [414].

Vitrinae, length of life of, [55].

Volvocineae, [202], [248].

Volvox, [204], [248].

Vorticellidae, conjugation of buds of, [287].

Vultures, length of life of, [11], [37].

Wallace, on constancy of number of individuals in successive generations, [12];