814 



INDEX 



Strongylocentrotus, 386, 387, 389, 406 



See Sea-urchin 

 Strongylofitoma, 602 

 Strongylus, 300 



Stylarioides, 477 



Stylaster, 158, 159 

 Style, 159* 



Stylonychia, 100 



Subcortical cavity of sponges, 120* 



Sub-cuticle, 299*' 



Subdermal cavity of sponges, 119* 



Sub-genital pit (Aurelia), 169* 



Sub-genital portico, 182* 



Sub-kingdom See Phylum 



Sub-mentum, 605 



Sub-radius, 139* 



Sub-tentacular canal, 399 



Sub-umbrella, 135* 



Succession of Life in time, 7 



Sucker (Sepia), 739* 



Sucking-disc, 408 



Suctorial mouths, 182* 



Summer eggs, 582 



Supplemental skeleton, 54, 56* 



Supporting lamella See Mesoglcea 



Swimming-bell See Nectocalyx 



Swimming ovaries, 309 



Swimming-plate, 210* 



Sycantha, 114 



Syce.tta, 114 



Sycettidce, 114* 



SYCON : External characters, 106, 

 107 : Microscopic structure, 108, 

 109, 110 : Systematic position, 114 : 

 Development, 124, 125, 126 



Sycon gelatinosum, 117, 118 



Sycon raphanus, 126 



Sycon-type of sponge, 118, 119* 



Syllida, 486, 487 



Syllis ramosa, 476 



Symbiosis, 65* 



Symmetry, 42*, 43 : Polype and 

 Medusa, 138 : Tealia, 188, 190 



Symphyla, 598, 599*, 600, 602, 661 



Synapta, 414, 425, 428 



Synapticula, 203* 



Synaptidce, 420 



Syncarida, 552*, 567 



Syn-cerebrum, 542*, 615 



Syncoryne, 145 



Syncrypta, 73 



Syncytial ectoderm, 293* 



Syncytium, 26*, 293* 



Syngnatha, 600*, 601, 602 



T 



~L 



ABANUS, 623, 629 

 Tabulae, 15,*, 202 

 Tactile cones, 253*, 263 

 Tactile organs, 39 



Tcenia coenurus, 277 



Tcenia crassicollis, 280 



Tcenia cucumerina, 264 



Tceniadce, 250 



Tcenia echinococcus, 256, 257, 277, 278, 

 281 



Tcenia mediocanellata, 281 



Tcenia saginata, 281 



Tcenia serialis, 277 



Tcenia serrata, 280 



T^NIA SOLIUM, 243, 281 : General 

 features, 242, 243, 244 : Nervous 

 system, 244 : Excretory organs, 244, 

 245 : Reproductive organs, 245, 246 : 

 Development, 246, 247 : Systematic 

 position, 250 



Tamiole, 172* 



Talitrus, 569 



Tanaidacea, 553*, 569, 570, 587 



Tanais, 553, 569 



Tape-worm See Tsenia and Cestoda 



Tardigrada, 657, 658, 659*, 661, 662 



TEALIA : External characters, 184, 

 185 : Enteric system, 185, 186 : 

 Cell layers, 186, 187 : Muscular 

 system, 184, 187, 188 : Symmetry, 



188 : Microscopic structure, 188, 



189 : Nervous system, 190 : Repro- 

 ductive organs, 190 : Development, 

 190, 191 : Systematic position, 194 



Tealidce, 194* 



Tectibranchia, 714*, 736 



Teloblast, 453* 



Telolecithal egg, 217* 



Telotrochal larvae, 474* 



Telson, 528* 



Temnocephala, 253, 255, 264, 273, 274 



Temnocephalea, 249*, 253, 255, 256, 

 264, 267, 273, 274, 279, 283 



Tendon, 38* 



Tentacle roots, 155* 



Tentacle sheath, 208* 



Tentacles, 33*, 93 



Tentacular canal, 212 



Tentaculifera, 93* : Body and ten- 

 tacles, 101, 102 : Nucleus, contractile 

 vacuoles, shell, colonies, reproduc- 

 tion, 101, 102, 103 



Tentaculocyst, 155*, 172 



Tentorium, 610* 



Terebella, 462 



Terebellidce, 461, 462 



Terebra, 718 



Terebratula, 358, 359, 360 



Terebratulidce, 359* 



Terebratulina, 365 



Teredo, 678, 682, 683 



Terga, 563* 



Tergum, 528* 



Termites, 617 



Tessera, 176, 177 



Testis See Spermary 



Tethys, 715 



