INDEX 



835 



Septum, 205* 



Serialaria, 348 



Serosa, 631, 659 



Serpula, 472, 476, 477, 488 



Serpulida>, 468, 472, 485, 4S6 



Sertularians, 143 



Seta, 439, 440, 441 



Seta, provisional, 452 



Setigerous sac, 441*, 452, 453, 457 



Sexual dimorphism, 40* 



Sexual generation, 140 



Shell-gland, 243, 529, 692, SOU 



Shell-gland (Apus), 534, 535" : (Crus- 

 tacea), 596 



Shell, Magellania, 360. 361 : Brachiopoda, 

 367, 368 : Mussel, 682 : Pelecypoda, 

 697 : Chiton, 714 : Triton, 721, 722, 

 723 : Gastropoda, 737 : Scaphopoda, 

 756: Sepia, 761, 762: Nautilus, 776, 

 Cephalopoda, 793 



Shelly loop, 360 



Ship-worm, 696 



Shrimp. 526, 569, 587 



Sicula, 167* 



Sigaretu*, 740 



Siiicispongise, 126* 



Silver tish, 632 



Sinupalliata, 696*, 698, 707 



Sinupalliate, 699* 



Sinus, 554 



Siphon, 399, 428, 498, 723 



Siphonal process, 722* 



Siphoniata, 711 



Siphonodentalium, 756 



Siphonoglyphe, 187* 



Siphonophora, 142*, 159, 160, 162. 163, 

 164, 165, 166, 226 



Siphonozooid, 202* 



Siphons, inhalant and exhalant, 681*, 698 



Siphuncle, 776* 



Sipunculidce, 496, 498, 502, 503 



Sipunculoidea, 496*, 497, 498, 499, 502 



SIPTJNCULUS NUDUS, General external 

 features, 492, 493: Body-wall, 493: 

 Coelome, 493 : Blood-vascular system, 

 493 : Alimentary canal, 493, 494 : 

 Nervous system, 494: Nephridia and 

 gonads, 495 : Systematic position, 496 



Skeleton, 31* : Lobosa, 49 : Foraminifera, 

 51, 53 : Heliozoa, 59 : Radiolaria, 61 : 

 Mastigophora, 73 : Ciliata, 96 : Pori- 

 fera, 120 : Actinozoa, 202 : Sepia, 763 : 

 Cephalopoda, 796 See also Shell and 

 Body-wall 



Skin, 31* See Body-wall 



Slime glands, 608 



Slugs, 680, 734 



Snails, 680, 734 



Solarium, 7 7 



Solecurtus strigillatus, 700 



Solen, 711 



Solenocytes, 338, 479 



Solenogastres, 713*, 715, 717, 718, 720, 

 721 , 805 



Solenomya, (51)5 



Solpugida, 661*, 662, 663, 667, 668, 670 



Somatoblast, 45i 



Somatopleure, 631* 



Spadella, 31(5 



Spadix, 780*, 781 



Spatangoidea, 412*, 417, 422 



Species, 1*, 113* 



Specific name, 2* 



Sperm, 20, 30 



Spermary, 39" 



Spermatidia, 344 



Spermatozoon See Sperm 



Spermiduct, 40* 



Spermotheca, 308* 



Sphseridia, 395*, 417 



Sphasroma, 568 



Sphcerophrya, 100 



Spicules. 32*, 203 



Spiders, 526, 653 



Spinnerets, 664 



Spinning-glands, 664 



Spinules, 240* 



Spireme, 18* 



Spirifera, 664, 



Spiroloculina, 53 



Spirorbis, 489 



Spirorbix l-ris, 484 



Spirilla, 790, 794, 795 



Splanchnopleure, 631* 



Sponge! ia, 121 



Spongilla, 118 



Spongillidce, 121, 126 



Spongin, 112, 120*, 121 



Spongin-blasts, 120* 



Sporangium (Mycetozoa), 66, 67 



Spore, 40, 67, 75, 80, 81, 88 



Spore formation, 40, 56, 59, 60, 63, 65, 

 66, 67, 75, 79, 80, 87, 89, 98 



Sporocyst 245* 



Sporogony, 84*, 85 



Sporosac, 151* 



Sporozoa, 46* : Example, 80 : Classifica- 

 tion and general organization, 81 



Sporozoites, 80, 81, 83, 84, 85, 86, 88 



Springtails, 632, 640 



Squame, 544* 



Squammulina, 51, 52 



Squids, 790 



Squilla, 592 



Stwchnrt Ill-mi), 232 



Statoblasts, 353 



Statocones, 707*, 787 



Statocysts, 2(5S, 295, 691, 707, 79s 



Statolith, 268, 7<>7' :: 



STARFISH, External characters, 375,376, 

 377: Transverse action of arm, 378: 

 Vascular and nervous systems, 379 : 

 Structure of disc, 380 : Body-wall and 

 coelome, 381 : Digestive system, 382 : 



