INDEX 



835 



Septum, 205* 



>. r'.'ilnria, 348 



Serosa, 631, 659 



Serpula. 472, 476, 477, 488 



SerpHlidce, 468, 472, 485, 486 



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, 800 



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

 tacea), 596 



Shell, Magellania, 360. 361 : Brachiopoda, 

 367, 368 : Mn#sd, 682 : Pelecypoda, 

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

 723 : Gastropoda. 737 : Scaphopoda, 

 756: Sepia, 761, 762: NautUux, 776, 

 Cephalopoda, 793 



Shelly loop, 360 



Ship-worm, 696 



Shrimp. 52(3. 569, 587 



Sirula, 167* 



Sit-/rrretu--i, 740 



Silicispongiae. 126* 



Silvertish, 632 



Sinnpalliata, 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. 21 2' 



Siphons, inhalant and exhalant, 681*, 698 



Siphuncle. 776* 



SipuncmlidcR, 496, 498, 502, 503 



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



SIPTTXCULUS KUDUS, General external 

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

 Ccelome, 493 : Blood-vascular system, 



1493: 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, 695 



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



Somatoblast, 450 



Somatopleure, 631* 



Spadella, 316 



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* 



Sphaeridia, 395*, 417 



Sphseroma, 568 



Sphcerophrya, 100 



Spicules. 32*, 203 



Spiders, 526, 653 



Spinnerets, 664 



Spinning-glands, 664 



Spiuules, 240* 



Spireme, 18* 



Spirifera, 664, 



Spiroloculina, 53 



Spirorbis, 489 



Spirorbi? Icevis, 484 



Spirula, 790, 794, 795 



Splanchnopleure, 631* 



Spongdia, 121 



SponyiUa, 118 



Spongillidce, 121, 126 



Spongin, 112, 120*, 121 



Spongin-blasts, 120* 



Sporangium (Mvcetozoa), 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 



Sq-uilla, 592 



Stcecharthrum, 232 



Statoblasts, 353 



Statocones, 707*, 787 



Statocysts, 268, 295, 691, 707, 798 



Statolith, 268, 707* 



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 : 



