Siphonophora, origin of germ-cells of, [202].

Sirenia, [261].

Sirex, length of larval life of, [15].

Smerinthus tiliae, length of life of imago of, [45];

ocellatus, [395].

Solenobia triquetrella, length of life of female of, [45];

death of parthenogenetic forms of, [64], [293].

Solidago, time of flowering changed, [415].

Soma, [122], [125], [130], [140], [144], [154], [155].

Somatic cells, [27], [28], [75], [111], [145], [158].