INDEX 



775 



Rock systems, 7 



Rocks, igneous and aqueous, 7* 



1-iotalia, 52 



Rotation, aense of, 37 



Rotifer, 303 



Rotifera, 229, 303* : External characters, 

 304 : Digestive organs, 307 : Excretory 

 system, 308 : Nervous system and 

 Sense-organs, 308 : Reproduction and 

 Development, 309 : Ethology, 309 : 

 Affinities, 309, 483 



Round-worms, 275 See Neurathelmin- 

 thes 



Rugosa, 197* 



IACCAMMIXA, 53 

 Saccocirrus, 438 

 Sacculina, 534, 535, 553 

 Srt'fitfft, 293, 294, 295 

 Saline? fa, 219, 220 

 Saliva, 32* 

 Salivary glands, 32* 

 Salivary receptacle, 576 

 SaJnviciiKi, 446 

 Salpiixja'cn, 72 

 Saltatoria, 5S7 

 Sand -hopper, 524 

 Sarcocystidea, 76*, 79 

 SarcocysPis, 79 

 Sarcolemma, 26* 

 Sarcophaga, 595 

 Sarcoptf-* xcfifiin-i, 616 

 S'.tr*ia, 135 

 Scale-insects, 585 

 Scallop, 647 

 Scaphopoda, 705 

 Schizonemertea, 274" 

 Schizopod-stage, 553 

 Schizopoda, 523*, 536 

 Scirtopoda, 304*, 300, 307 

 Sclerite, 520* 

 Scleroblast, 101*, 111 

 Scolex, 231 

 Scolopendra, 568 

 Scolopendrella, 567, 569 

 SCORPION See BUTHUS. 

 Scorpionida, 611*, 613, 624 

 Scorpion -spiders, 612 

 S<'robint/<<>'ia piperata, 650 

 Snttiy;.rrf, 567, 5H<) 

 Scyllaru*, 537, 539 

 Scyphistoma See Scyphula 

 Scyphozoa, 118, 156, 163*, 171 

 Scyphula, 161*, 162 

 Sea-anemones, 118, 181 See Tealia 

 Sea-blubbers, 169 



SEA-CUCUMBER, External features, 369 : 

 Structure of body- wall, 370 : Ambu- 



lacral system, 370 : Nervous-vascular 

 systems, 370: Cceiome, 371: Enteric 

 canal, 372 : Reproductive organs, 372 : 

 Development, 372 : Systematic posi- 

 tion, 381 



Sea-cucumbers, 346 See Holothuroidea 



Sea-fans, 182 



Sea-firs (Sertularians), 133 



Sea-hares, 684 



Sea-lilies, 380 



Sea-mats, 311 See Polyzoa 



Sea-mussel, 646 



Sea-pens, 183 



SEA-URCHIX, External features, 363, 364, 

 365 : Corona, 364 : Aristotle's lantern, 

 366 : Nervous system, 367 : Ambu- 

 lacral system, 367 : Enteric canal, 367, 

 368 : Cceiome, 368 : Blood- vascular 

 system, 368 : Reproductive organs, 

 368 : Development, 368 : Systematic 

 position, 381 



Sea-urchins, 346 See Echinoidea 



Secondarj- axis, 40* 



Secretion, 22* 



Sedentaria, 427* 



Segment, 41 



Segmental organ See Nephridium 



Segmentation of oosperm, 20* 



Segmentation-cavity See Blastocwle 



Segmentation-nucleus. 19" 



Seiton, 309 



Selenaria, 320 



Sefenariidce, 321, 324 



Semostomse, 164*, 169, 213 



Sense-organs, 37 : Obetia, 125 : Trachj'- 

 lin;v, 149: Aurelia, 160: Hormiphora, 

 198, 203 : Platyhelminthes, 253 : Ne- 

 mertinea, 271 :" Cha?tognatha, 2 ( .)5 : 

 Brachionus, 301 : Rotifera, 3< >8 : 

 Phoronis, 329 : Starfish, 348 : Sea- 

 urchin, 367 : Nereis, 410, 411 : 'Ghreto- 

 poda, 438 : Sipunculus, 454 : Hiri/flo, 

 472 : Hirudinea, 478 : Apn, 494 : 

 Astacus, 513 : Crustacea, 551 : Peri- 

 patus, 560 : Periplaneta, 579 : Insects, 

 595, 596, 597 : Scorpion, 609 : Arach- 

 nida, 621 : Mussel, 642 : Pelecypoda, 

 657 : Amphineura, 668 : Triton, 674, 

 676, 682: Gastropoda, 695: fihodope, 

 707 : Sepia, 720 : Nautilm, 734 : 

 Cephalopoda, 743, 744 See also Eyes, 

 Auditor}- organs, Olfactory orgaiis, 

 Gustatory organs, Tactile organs, 

 Osphradia 



SEPIA, External features, 708, 709 : 

 Shell, 711 : Chromatophores, 711 ; 

 Mantle - cavity, 712, 713: Internal 

 skeleton, 712 : Alimentary system, 

 712 : Ink-sac, 714 : Vascular system, 

 714 : Cceiome, 715 : Ctenidia, 716 : 

 Nervous system, 717 : Sensory organs, 

 720 : Excretory organs, 722 : Repro- 



