INDEX 



641 



Sphaerophrya, 108; 107 



S. sol, loi 



Spherularia, 226 ; 226 



Spicules, of Alcyonaria*, 160, 161, 

 163 ; of Porifera, in, 113, 115; of 

 Radiolaria*, 71, 75, 76 



Spines, of Echinodermata, 550; of 

 Echinoidea, 566; of Ophiuroidea, 

 562 ; of Starfish, 558 



Spinnerets, 458 ; 460, 461 



Spiracles, of Arthropoda, see Stig- 

 mata; of Blastoidea, 582 



Spirochaeta, 465 



Spirochona, 107; 38 



S. gemmipara, 108 



Spirographis, 231 



Spirostomum, 102; 35 



S. ambiguum, 103 



Spirula, 524; 5 13, 5^4 



Spirulirostra, 524; 524 



Sponges, see Porifera 



Spongilla, 119 



S. lacustrisy 119 



Spongillidae, 116, 117 



Spongin, 113 



Spongioplasm, 8 



Sporangium, 82 



Spore cases, 33 ; 88, 89, 92, 93 



Spores, 33 ; 8, 48, 64, 75, 82, 85, 88, 



89, 91, 92, 93, 94 

 Sporoblasts, 82; 33, 85, 86, 93 

 Sporocyst, 33; 18, 85, 91 

 Sporont, 31, 32, 87 

 Sporozoa, 82; 4, 38, 39 

 Sporozoites, 31; 82, 85, 86, 88, 89, 



90, 92, 93 

 Spumellaria, see Peripylaea 

 Squilla, 351 



S. mantis, 351 



Staggers, see Gid 



Stalk, of Brachiopoda, 537 ; of Cri- 

 noidea, 550, 578, 582; of Entero- 

 pneusta, 585; of Lepas, 338; of 

 Pelmatozoa, 582; of Protozoa*^, 4, 

 60, 81,104, io7> io8> T09;of Ptero- 

 branchia, 595, 596 



Stalked gland organ, 186 



Staphylocystis , 202 



Statoblasts of Polyzoa, 532 



Statocysts (Otocysts), of Calypto- 

 blastea, 136; of Crustacea, 306; of 

 Turbellaria, 176 



Statolith of ascidian tadpole, 598 



Stauromedusae, 150; 152 



Stegomyia, 224 



Stenopodium, 298 



Stentor, 102; 13, 97, 98 



S. coeruleiis, 18, 103 



Stephanoceros, 213 



Stereum, 82 



Sterna, of Arachnida*, 450, 453, 

 465; of Crustacea, 295, 367; of 

 Myriapoda*, 378, 381 



Sternites, see Sterna 



Stewart's organs, 569 



Stigma of Odonata, 415 



Stigmata (Spiracles), of Arachnida, 

 447, 462, 465 ; of Insecta, 391, 392, 

 393, 439 ; of Myriapoda, 378, 381 ; 

 of Onychophora, 284 



Stigmata of Tunicata, 592, 594, 595 



Stimuli, Effect of, on Protozoa, 33 



Stipe, 148 



Stolon, of Alcyonaria, 160 ; of Hydra- 

 tuba, 155 ;of Hydrozoa, ^eeHydro- 

 rhiza; of Tunicata, 599, 599, 605 



Stomach, see Alimentary canal 



Stomatopoda, 350; 298, 316, 349 



Stomodaeum (Fore gut), 121; of 

 Alcyonaria, 159; of Arthropoda, 

 278 ; of Ciona, 592 ; of Crustacea*, 

 307, 320, 340 ; of Ctenophora, 172 ; 

 of Insecta, 387; of Nematoda, 

 218; of Onychophora, 284; of 

 Rotifera, 212; of Tricladida (pha- 

 rynx), 181 ; of trochosphere, 250; 

 of Zoantharia, 164 



Stonecanal, 551,552, 560,564,570,580 



Streptoneura, 489; 478 



Strobilization, of Aurelia, 155, 157; 

 of Cestoda, 24, 199 



Stromatocystis , 582 



Stronibus, 490 



Strongyloid larva, 221 



Strongyloides stercoralis, 222 



Structureless lamella (Mesogloea), 

 125, 126, 128, 129, 130, 135, 140, 

 152, 156, 158, 159, 160, 161, 162, 

 163 



Stylaria, 258; 253, 259 



S. proboscidea, 258 



Stylets, of Insecta, 417 ; of Nemertea, 

 205 ; 206 



Stylommatophora, 495 



Stylonichia, 104; 37 



S. mytilus, 105 



Stylops, 442 



Subchela, 303 



41 



