i. 370, 373;

analogy of, to Ruminants, i. 373; influence of sexual selection on, i. 377.

LAMELLICORNIA, stridulation of, i. 380.

LAMONT, Mr., on the tusks of the Walrus, ii. 242; on the use of its tusks by the Walrus, ii. 257.

_Lampornis porphyrurus_, colours of the female, ii. 168.

LANCELET, i. 204, 212.

LANDOIS, H., on the production of sound by the Cicadae, i. 351; on the stridulating organ of the Crickets, i. 354; on _Decticus_, i. 355; on the stridulating organs of the Acridiidae, i. 356; on the presence of rudimentary stridulating organs in some female Orthoptera, i. 359; on the stridulation of _Necrophorus_, i. 378; on the stridulant organ of _Cerambyx heros_, i. 380; on the stridulating organs in the Coleoptera, i. 382; on the ticking of _Anobium_, i. 385; on the stridulant organ of _Geotrupes_, i. 380.

LANGUAGE an art, i. 55; articulate, origin of, i. 56; relation of the progress of, to the development of the brain, i. 57; effects of inheritance in production of, i. 58; complex structure of, among barbarous nations, i. 61; natural selection in, i. 61; gesture, i. 232; primeval, i. 235; of a lost tribe preserved by a parrot, i. 236.

LANGUAGES, presence of rudiments in, i. 60; classification of, i. 60; variability of, i. 60; crossing or blending of, i. 60; complexity of, no test of perfection or proof of special creation,