INDEX 



i 1 



Streptoneura, 683*, 688 



Strobila, 233 



Strengylocentrotus, 364 See Sea-urchin 



Strongylostoma, 570 



Stylarioides, 447 



Stylaster, 146, 147 



Stylonychia, 90 



Sub-genital pit (Aurelia), 15s 



Sub-genital portico, 171" 



Sul )-kingdom See Phylum 



Sub-radius, 129 



Sub-umbrella, 125'' 



Succession of Life in time, 7 



Sucker (Sepia), 709*, 710 



Suctorial mouths (Rhizosfcomeej, 170 



Summer eggs, 551 



Supporting lamella See Mesoglcea 



Swimming-bell See Nectocalyx 



Swimming-plate, 199, 200* 



Si/<-aiifha, 103 



Sycetta, 103 



Syceftidw, 103 



SYCOX : External characters, 96, 97 : 



Microscopic structure, 99 : Systematic 



position, 103 : Development, 113, 



114 



Sycon-type of sponge, 109* 

 8yllida,4:36, 446, 447 

 Sylli-* ramox'i . 44ii 

 Symmetry, 39*, 40 : Polype and Medusa, 



128 : Tealia, 176, 179" 

 Symphyla, 567*, 569 

 Xi/wi^tri, 390, 399, 402 

 Syna])ticula, 192* 

 Syn-cerebrum, 513* 

 Syncoryitf , 135 

 Syncrypia, 66 

 Syncytium, 99" 



T 



ABAKI'*, 590 



Tabula, 143*, 192 



Tactile organs, 37 



'fa a in ccp.nurus, 261 



Tii-nia crasxirof/ix, 265 



Trrnia echinocorcus, 246, 261, 262, 265 



Tfvnia mediocanellata, 265 



Tn' ii in- x((</l)inta, 265 



Ttrnia serrafa, 265 



T.ENIA SOLIUM : General features, 231, 

 232, 233 : Nervous system, 233 : Ex- 

 cretory organs, 234 : Reproductive 

 organs, 234 : Systematic position, 239 



Toeniole, 161* 



TaUtrii*, 543 



Taiiai*, 543 



Tape-worm See Tfenia and Cestoda 



Tardigrada, 626, 629 



TEALIA : External characters, 172, 173 : 

 Enteric system, 174, 175 : Muscular 



system, 173, 175 : Symmetry, 176 : 

 Microscopic structure, 177, 178 : Ner- 

 vous system, 179 : Reproductive 

 organs, 173, 179 : Development, 179, 

 180: Systematic position, 1*.'! 



Tectibranchia, 684*. 7<>5 



Telolecithal, 2U7* 



Telotrochal, 445* 



Telson, 498* 



T< nuKx-i.jiIiulri. 244. 264 



Ti mnortph'ili >/, 244 



Tendon, 35* 



Tentacles, 30* 



Tentaculifera, 82* : Body and tentacles. 

 90: Nucleus, contractile vacuolrs. 

 shell, colonies, reproduction, 92 



Tentaculocyst, 143*, 160 



Tentorium, 579 



Ti relieUa, 434 



TereMlidce, 433 



Terebra, 686 



Ter>l>,-iifnln, 336. 338, 339 



Terehra fat iff"-. 338 



T' ,- l>riit uli, i, i. 343 



Teredo, 047. 652 



Tergum, 498* 



Termites, 585, 603 



7V >.<?<), 165 



Tefhys, 684 



Tetrabranchiata, 736*, 739 



Tetramita, 66 



Tetrarhynrhus, 246 



Tetrastemma, 269 



ThalassopJanrta, 59 



Theca, 192* 



Thomson, J. Vaughan, 3 



Thorax, of Aptix, 489 : Antaeus, 499": 

 Periplaiiefa, 572, 574 : Solpugida, 615 



Thread- worms See Nemathelminthes 



Thyxanozoon, 240 



Thysanura, 583 



Ticks, 612 See Acarida 



Tiedemann's vesicle, 354*, 393 



Tintinnii.Unm, 85 



Tissues, 21* 



Tomojtteris, 447 



Tracheae, 33*, 562, 577, 578, 593 



Tracheal gills, 594* 



T^acheliastes, 531 



Trachelinx, 85 



Tfachelomonas, 66 



Trachylinae, 132* : General structure, 



142 : Sense organs, 143 : Tentacles, 



143 : Reproductive-organs, 144 : [De- 

 velopment, 144 



TrachymedussB, 132*, 142, 143, 144 



Tntp-iloot' Sp'uJtr, 623 



Tmpezia, 196 



Trematoda, Example, 226, 238*, : 242. 

 243. 244. 245, 24S, 249, 250, 251, '-252, 

 253, 254, 256, 258, 259, 264, 265, 266, 

 267 



