INDEX 



835 



Septum, 206 



.s'» ri'i/'iri'i. :;js 



Serosa, 631, 669 



Serpula, I7J. lT«i, 477, 488 



Serptdidce, 468. 172, 185, 186 



S< rtulatians, 143 

 *3!>. 440, 441 



Seta, provisional, 4.V2 



Setigerooa sac, 441*, 4.V2, 4.~>3, 4.">7 



Sexual dimorphism, 40* 



Sexual generation, 140 



Shell-gland. SMS, 529, 682, 800 



Shell-gland -(Apus), 534, 635* : (Crus- 

 tacea), 596 



Shell, Magellania, 360. 361 : Braehiofpda, 

 3(17, 368 : M*S$el, 682 : Pelecypoda. 

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

 723 : Gastropoda, 737 : Scaphopoda, 

 7 ."">»> : Sepia, 781, 762: Nemtuiu, 776, 

 Cephalopoda, 793 



Shelly loop, 380 



Ship-worm, 696 



Shrimp. 526, 588, 587 



Sicula, 167* 



SigarkiHS, 740 



Silicispongiae. 126* 



Silver fish, 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*, 188, 160, 162, 163, 

 164, 165. 166, 226 



Siphonozooid, 202* 



Siphons, inhalant andexhalant, 681*, 698 



Siphuncle, 776* 



Sipunculidce, 496, 498, 502, 503 



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



Siphni tu's ncdus, General external 

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

 Coelome, 493 : Blood-vascular system, 

 493 : Alimentary canal, 493, 494 : 

 Nervous system, 494: Nephridiaand 

 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 : Stjria, 763 : 

 Cephalopoda, 796 — See also Shell and 

 Body-wall 



Skin, 31* — See Body-wall 



Slime glands, 608 



Slugs, (.so. 734 



Snails, 680, 734 



Solariwn, 7 7 



Solecurtiut strigillatii*, 700 



Solen, 711 



Solenocytes, 338, 479 



Solenogastres, 713*, 715, 717, 7ls, 720, 

 721, so.") 



Solenomya , 685 



Solpugida. 881*. 882, 663, 667, 668, 670 



Somatolilast. 450 



Somatopleure, 631* 



Spadella, 316 



Spadix, 780*, 781 



Spatangoidea, 412*, 417, 422 



Species, l*, | [?* - 



Specific name, 2* 



Sperm, 20, 30* 



Spermary, 39* 



Spermatidia, 344 



Spermatozoon — Se.e Sperm 



Spermiduct, 40* 



Spermotheca, 308* 



Sphairidia, 395*, 417 



Sphaeroma, 568 



Spharophrya, 100 



Spicules, 32*, 203 



Spiders, 526, 863 



Spinnerets, 664 



Spinning-glands, 664 



Spinules, 240* 



Spireme, 18* 



Spirifera, 664, 



Spirolocu/iiui, 53 



Spirorhi*^ 489 



Spirorbi* lams, 484 



Spirula, 790, 794, 795 



Splanchnopleure, 631* 



Spongdia, 121 



SpongiUa, 118 



SpongUlida>, 121, 126 



Spongin, 112, 120*, 121 



Spongin-blattt, 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* 



Squammulhia, 51, 52 



Squids, 790 



Squilla, 592 



S/'irfui rth ru »t , 232 



Statoblasts, 353 



Statocones, 707*, 7 S 7 



StatocvBts, 268, 285, 691, 707, 788 



Statolith, 268, 707* 



Starfish, Kxternal characters, 875, 376, 

 377: Transverse action of arm, 378: 

 Vascular and nervous systems, 379 : 

 Structure of disc, 380 : Body-wall and 

 ccelome, 381 : Digestive system, 382 : 



