Silkworm infested by disease pébrine, due to Nosema bombycis, [107]
Simpson, on life-cycle of Ciliata, [148] n.
Siphon, of Echinus esculentus, [516];
of Echinarachnius parma, [546], [547]
Siphonia, [215]
Siphonoglyph, [334], [334], [369], [410]
Siphonogorgia, [349]
Siphonogorgiidae, [349]
Siphonophora, [297] f.;
dactylozooids, [299];