INDEX 



721 



Spicules, of Alcyonaria*, 183, 184, 

 186; of Porifera, 118, 120, 122, 

 123; of Radiolaha*, 80, 81, 83 

 Spines, of Echinodermata, 626; of 

 Echinoidea, 641 ; of Ophiuroidea, 

 638; of Starfish, 634 

 Spinnerets, 530; 532 

 Spiracles, of Arthropoda, see Stig- 

 mata; of Blastoidea, 659 

 Spiral cleavage, 281 ; 145 

 Spirochona, 114; 43 ; ^emmi/)ara, II4 

 Spirographis, 264 

 Spirostomum, no; 40; ambiguum, 



IIO 

 Spirula, 600; 588, 600 

 Spirulirostra, 600 ; 600 

 Sponges, see Porifera 

 Spongilla, 127; lacustris, 125 

 Spongillidae, 124 

 Spongki, 121 

 Spongioplasm, 12 

 Sporangium, 86 

 Spore cases, 38; 94, 98, 100 

 Spores, 37; 12, 38, 55, 70, 80, 86, 88, 



89, 94, 96, 98, 100 

 Sporoblasts, 87; 38, 89, 93, 100 

 Sporocysts, 22 ; 38, 89, 96 

 Sporogony, 37, 89 

 Sporont, 36, 37, 92 

 Sporozoa, 87; 8, 43, 44 

 Sporozoites, 36; 87-100 (passim) 

 Spumellaria, see Peripylaea 

 Squilla, 392 ; mantis, 391 

 Stainers, 476 



Stalk (Peduncle), of Brachiopoda, 

 613 ; of Cirripedia*, 377, 378, 379, 

 380, 382; of Pelmatozoa*, 625, 

 654, 655, 658, 659; of Protozoa*, 

 8, 65, 86, III, 115, 116; of Ptero- 

 branchia, 668 ; Proboscis, 662 

 Stalked gland organ, 211 

 Staphylinidae, 495 

 Staphylocystis , 229 

 Statoblasts of Polyzoa, 609 

 Statocysts (Otocysts), of Calypto- 

 blastea, 156; of Crustacea, 342; of 

 Turbellaria, 202 

 Statolith of ascidian tadpole, 676 

 Stauromedusae, 172 

 Stegomyia, 252, 509 

 Stenopodium, 334, 335 

 Stentor, no; 18, 104, 105; coeruleus, 



23, no 

 Stephanoceros, 241 



Sterna, 332; of Arachnida*, 522, 525, 

 537; of Crustacea, 332, 409; of 

 Myriapoda*, 421, 424 

 Sternites, see Sterna 

 Sternorhyncha, 476 

 Stewart's organs, 645 

 Stigma of Odonata, 472 

 Stigmata (Spiracles), of Arachnida, 

 519, 536, 537;of Insecta, 440, 441, 

 444, 508, 509; of Myriapoda, 421, 

 424; of Onychophora, 320 

 Stigmata of Tunicata, 672, 673 

 Stimuli, Effect of, on Protozoa, 38 

 Stipe, 170; 171 

 Stipes, 427 



Stolon, of Alcyonaria, 183; of Hy- 



dratuba, 178; of Hydrozoa, see 



Hydrorhiza ; of Tunicata, 677, 678, 



678, 680, 681, 683 



Stomach, 130. See also Alimentary 



canal 

 Stomatopoda, 391 ; 336, 353, 389 

 Stomodaeum (Fore gut), 130; of 

 Anthozoa*, 182, 187; of Arthro- 

 poda, 314; of Ciona, 669; of 

 Crustacea*, 344, 358, 379; of 

 Ctenophora, 195; of Insecta, 432; 

 of Nematoda, 248 ; of Onycho- 

 phora, 320; of Rotifera, 240; of 

 Tricladida (pharynx), 206; of 

 Trochosphere, 282 

 Stone canal, 626, 627, 637, 639, 646, 



647, 658 

 Strepsiptera, 429 

 Streptoneura, 563; 552 

 Strobilation, of Aurelia, 178, 180; 



of Cestoda, 143, 225 

 Stromatocystis, 658 

 S trombus, 563 

 Strongyloid larva, 251 

 Strongy hides stercoralis, 254 

 Structureless lamella (Mesogloea), 

 146, 150, 156, 161, 174, 179, 180-6 

 {passimi) 

 Stylaria, 291 ; 286; proboscidea, 292 

 Stylets, of Hemiptera, 474 ; of Nemer- 



tea, 233 ; 234 

 Stylommatophora, 570 

 Stylonichia, 1 1 1 ; 42 ; mytilus, 112 

 Sty lops, 514 

 Subchela, 339 

 Subchelate limbs, 391, 401, 415, 515, 



530 

 Subdermal cavities, 123 



