INDEX 



813 



Nephridia and gonads, 487, 488 : 

 Systematic position, 512 

 Skeleton, 32* : Lobosa, 49 : Foramini- 

 fera, 55, 56 : Heliozoa, 59 : Radio- 

 laria, 63 : Flagellata, 75 : Ciliata, 

 97, 98 : Porifera, 120 : Actinozoa, 

 200 : Sepia, 742 : Cephalopoda, 

 772, 773 See also Shell and Body- 

 wall 



Skin, 32* See Body-wall 



Slime glands, 591 



Slugs, 663, 715 



Snails, 663, 715' 



Solarium, 718 

 Solecurtus strigillatus, 682 



Solen, 692 



Solenocytes, 331*, 351, 468 

 Solenogastres, 694*, 695, 696, 697, 

 698, 699, 700, 702, 781 



Solenomya, 677 



Solpugida, 645*, 647, 648, 651, 652, 653 



Somatoblast, 440 



Somatopleure, 614* 



Spadella, 310 



Spadix, 758*, 759 



Spatangoidea, 403*, 408, 413 



Species, 1*, 114* 



Specific name, 2* 



Sperm, 21, 31* 



Spermary, 40* 



Spermatidia, 337* 



Spermatogenesis, 31* 



Spermatozoon See Sperm 



Spermiduct, 40* 



Sperm-mo rulae, 83* 



Spermotheca?, 303*, 452* 



Sperm-reservoirs, 471 



Sphamdia, 387*, 408, 412 



Sphseroma, 554 



Sphcerophrya, 102 



Spicules, 32*, 200, 361 



Spiders, 514, 637, 645. 648, 651, 653, 

 656 



Spinnerets, 649* 



Spinning-glands, 646, 649 



Spinules, 237* 



Spinulosa, 402 



Spiral segmentation, 269* 



Spire me, 19* 



Spirifera, 360, 361 



Spirilla, 74 



Spirochcetes, 74 



Spiroloculina, 54 



Spirorbis, 477 



Spirorbis Ice.vis, 473 



Spirilla, 767, 771, 772 



Splanchnopleure, 614* 



Spongelia, 121 



Spongilla, 119 



SpongiUidcB, 122, 126 



Spongin, 112*, 120, 122 



Spongin-blasts, 122* 



Sporangium (Mycetozoa), 68, 69 



Spore, 41, 50*, 69, 82, 83, 85, 87, 88, 

 89, 90 



Spore formation, 41, 56, 61, 63, 67, 68, 

 69, 82, 83, 85, 86, 87, 89, 90, 99 



Sporocyst, 241* 



Sporogony, 86*, 87 



Sporosac, 151* 



Sporozoa, 46* : Example, 82 : Classi- 

 fication and general organisation, 83 



Sporozoites, 82, 83*, 85, 86, 87, 88, 89 



Springtails, 616, 625 



Squame, 531* 



Squammulina, 53, 55 



Squids, 767 



Squilla, 577 



Stcecharthrum, 229 



STARFISH, External characters, 368, 

 369, 370 : Transverse section of 

 arm, 370, 371 : Vascular and nervous 

 systems, 372 : Structure of disc, 

 373 : Body-wall and ccelome, 373 : 

 Digestive system, 374, 375 : Ambu- 

 lacral system, 375 : Reproductive 

 system, 378, 379 : Development, 

 380, 381, 382, 383, 384, 385, 386: 

 Systematic position, 405 



Starfishes, 3H8 See Asteroidea 



Statoblasts, 346* 



Statocones, 689*, 765 



Statocysts, 263*, 289, 467*, 542*, 674, 

 689, 765*, 774 



Statolith, 263, 289, 467*, 689* 



Stauromedusse, 175*, 176, 177, 224 



Stelechopus, 477 



Stenocyphus, 176 



Stentor, 94, 96 



Stephanoceros, 321, 323, 324 



Sternal canal, 528* 



Sternaspis, 460, 461, 464, 465, 468 



Sternaspis spinosa, 461 



Sternum, 528* 



Stewart's organs, 416* 



Stichopoda, 406 



Stichotricha, 97 



Stick-insects, 617, 621 



Stigma (Euglena), 70 



Stigmata, 593*, 607, 627, 640 



Stinging capsule See Nematocyst 



Stolon, 194* 



Stomach See Digestive system 



Stomatogastric system, 437 



Stomatopoda, 555*, 577, 578, 581 



Stomidia, 199* 



Stomodaeal canal, 212* 



Stomodseum, 172*, 210 



Stone-canal, 376*, 377, 391 



Stony-corals, 129, 193, 199 



Stratiodrilus tasmanicus, 331, 332 



Strepsiptera, 625, 636 



Streptoneura, 713*, 715, 717, 720, 722, 

 724, 725, 727, 728, 729, 735 



Streptophiurae, 403* 



Strobila, 243*, 256 



