722 



INDEX 



Subgenital pits, 174 



Subimago, 481 



Submentum, 427 



Subneural gland of Tunicata, 672 



Suboesophageal ganglion, see Gan- 

 glion, Suboesophageal 



Substratum, 3 



Subtentacular canals, 656 



Subumbral pit, 174 



Subumbrellar cavity, 156, 158; ecto- 

 derm, of Medusa, 156; of trocho- 

 sphere, 282; musculature, 156 



Suctoria, 114; 8, 19 



Sulcus, 54 



Summer eggs of Cladocera, 367; of 

 Mesostomum, 213 



Superlinguae, 428 ; 306, 463 



Supero-marginal ossicles, 634 



Superposition image, 313 



Supraoesophageal ganglia, see Gan- 

 glion, Cerebral 



Surface, of Ciliata, 105 ; of Protozoa, 

 12, 20, 22. See also Ectoplasm 



Suture line of ammonoid shell, 605 



Swarm spores, 38 



Swarming of Polychaeta, 278. 



Sycon, 126; 119; raphanus, 125 



Sycon grade, 120 



SylliSy 268; 264, 266, 279; ramosa, 

 280 ; 279 



Symbiosis, 44 n. ; 44, 47, 52, 68, 1 1 1 , 



193, 213, 470 



Symmetry, 143, 633; of Actinozoa, 

 182; of Echinodermata, 623, 624, 

 633 ; of Metazoa, 143 ; of Protozoa, 

 8. See also Bilateral symmetry, 

 Radial symmetry 



Sympathetic system, of Crustacea, 

 340; of Insecta, 448 



Symphyta, 500 



Symplasts, 10 



Synagoga, 386; mira, 386 



Synalpheus, 386 



Synapse, 138, 149 



Synapta, 652; 650, 653 



Synaptida, 652 



Syncarida, 392; 389 



Syncytia, 10, 100, 102. See also 

 Plasmodia 



Syngamy, 30 ; 6, 37 ; of Ciliophora*, 

 30 n., 33, 34, 35, 107, H4, 115; of 

 Dinoflagellata, 54; of Mastigo- 

 phora, 45 ; of Sarcodina*, 72, 80, 

 83, 85, 86; of Sporozoa*, 88-100 



(passim) ; of Volvocina*, 31, 46, 56, 

 57> 58 ; of Zoomastigina, 59 



Syracosphaera, 50 ; pulchra, 51 



Syringopora, 186 



Syrphus, 511 



Syzygy, 88 and n. ; 89, 90, 94, 95 



Tabanus, 506 



Tachardia lacca, 478, 481 



Tachinidae, 512 



Tactile organs, see Sense organs 



Taenia, 224, 230; coenurus, 228; 

 echinococciis , 229, 230; serrata, 

 228 ; solium, 226, 227 



Taenioglossa, 563 



Taeniothrips incovsequeiis, 485 



Tagmata, 308 ; of Arachnida, 308 ; of 

 Crustacea*, 308, 332, 370, 387; of 

 Insecta*, 308, 483 ; of ?vIyriapoda, 

 308 ; of Onychophora, 308. See also 

 Abdomen, Cephalothorax, Head, 

 Mesosoma, Metasoma, Opistho- 

 soma, Prosoma, Pygidium, Thorax, 

 Trunk 



Tail, 662 ; 622 ; of Chaetognatha, 618, 

 619, 620, 622; of Chordata, 662; 

 of Tunicata, 675, 677, 679, 686 



Tail fan, 388 ; 391, 392, 393, 398, 404 



Tanaidacea, 395 



Tanais, 395 



Tardigrada, 539 



Tarsus, 428 ; 464, 483, 485, 493, 495, 

 512 



Tealia, 193 



Tectibranchiata, 567 



Teeth, of Echinoidea, 645 ; of Ophiu- 

 roidea, 639. See also Radula 



Tegenaria guyonii, 532 



Tegmen, 655 



Tegmentum, 549 



Tegmina, 466 



Telosporidia, 88 ; Reduction division 

 of, 27-8, 37 



Telson, 306-7; of Arachnida*, 517, 

 524; of Crustacea*, 326, 328-9, 

 332, 355, 358, 368, 372, 386, 395, 

 400; of Lithobius, 421; of Trilo- 

 bita, 324 



Te7nnocephala , 216; minor, 217 

 Temnocephalea, 216 

 Temperature, 4, 42 

 Tentacle sheath, 608 

 Tentacles, of polyp and medusa, 150, 

 151, 152, see also Tentaculocysts ; 



