INDEX. 



321 



Spongida, 40, 54 ; skeleton of, 

 55; sarcoids of, 55; aqui- 

 ferous system of, 55, 56 ; re- 

 production of, 56, 57 ; classi- 

 fication of, 57 ; distribution 

 of ,'in space, 57 ; in time, 58 ; 

 affinities of, 50, 58 



Spongilla, reproduction of, 56, 

 57 ; sarcoids of, 57 



Spores of Sponges, 56 



Sporosac of Corynida, 73, 74 



Squamae of Aphrodite, 167 



Squids, 274, 276 



Squilla, 191 



Staggers of sheep, 146 



Statoblasts, 25, 238, 239 



Stauridce, 120 



Stauridia, 75 



Steganodictyum, 58 



Steganophthalmata (Medusae), 

 84,93 



Stem-muscle, of Vorticella, 61 



Stemmata (see Ocelli) 



Stenaster, 140 



Stentor, 63 



Stephanoceros, 155, 157 



Stephanomiadce, 84 



Sterelmintha, 147 



Sternaspis, 160 



Sternum of Crustacea, 173, 

 174 



Stichostega, 50 



Stigmata, of Physophoridce, 

 82; of Leeches, 163; of 

 Arachnida, 200 ; of Insecta, 

 213 



Stolons, of Foraminifera, 47 ; 

 of Composite Actinozoa, 

 105 ; of Social Tunicata, 243 



Stomapoda, 177 ; characters of, 

 191 



Stomatodendra, 92 



Strepsiptera, 225 



Stringocephalus, 247 



Strobila, of Rhizostomidce, 90 ; 

 of Tceniada, 144 



Strombidce, 262, 265 



Strombus, 265 



Strophalosia, 248 



Strophomena, 248 



Strophomenidce, 248 



Swarm-spores of Sponges, 57 



Swimmerets of Lobster, 174, 

 175 



Synapta, 138 



Synapticulae, 105 



Synaptidce, 136, 138 



Syndendrium, 93 



Tabanidoe, 222 

 Tabulae of Corals, 104 

 Tabulata, 105, 119, 120 

 Tceniada, 141 ; characters and 



development of, 142-146 

 Talitrus, 190 

 Tank-worms, 153 

 Tape-worms, 142-146 

 Tardigrada, 200, 201 

 Tarsus of the limbs of Insects, 



210 



Tectibranchiata, 263, 267 

 VOL. I. 



Tellina, 257 



Tellinidce, 256, 257 



Telson, of Crustacea, 172 ; of 

 Lobster, 174 ; of Limulus, 

 187 ; of Scorpion, 203 



Tentacles, of Hydra, 70; of 

 Calycophoridce, 80 ; of Phy- 

 sophoridce, 82 ; of Medusidce, 

 86 ; of Hydra-tuba, 89 ; of 

 Actinia, 100 ; of Alcyonaria, 

 107 ; of Pleurobrachia, 111 ; 

 of Holothuroidea, 136, 137 ; 

 of Polyzoa, 236 ; of Tunicata, 

 241; of Cuttle-fishes, 271, 

 275, 276 



Tentaculites, 168, 283 



Terebella, 165 ; development 

 of, 165 



Terebratella, 247 



Terebratula, 229, 247 



Terebratulidce, 247, 250 



Terebratulina, 247 



Teredo, 258 



Tergum, of the exoskeleton of 

 Crustacea, 173, 174; of 

 Arachnida, 198 



Terricpla, 163 



Termites, 219; communities 

 of, 219-221 



Test, of Foraminifera, 46, 47, 

 48 ; of Echinoidea, 124, 125 ; 

 of Tunicata, 240 



Testacella, 229, 267 



Tetrabranchiata (Cephalopo- 

 da), 274 ; characters of, 278 ; 

 divisions of, 279; distribu- 

 tion of, in time, 284 



Teuthidce, 276, 281, 284 



Thalassemacea, 160 



Thalassicolla, 53, 54 



Thalassicollida, 53 



Theca of sclerodennic Coral- 

 lum, 102 



Theca, 269, 283 



Thecaphora, 76, 78 



Thecidce, 119 



Tlieddidce, 247 



Thecidium, 247 



Thecosomata, 269 



Thelyphonidce, 203 



Thoracica (Cirripedia), 177 ; 

 characters of, 182 



Thread-cells, 67 ; of Actinozoa, 

 98 



Thread-worms, 141, 152 



Thysanura, 217 



Ticks, 202 



Tongue, of Insects, 211; of 

 Gasteropoda, 259 ; of Cepha- 

 lopoda, 271 



Tornatella, 267 



Tornatellidce, 263, 267 



Tortoise Encrinite, 139 



Toxoceras, 280 



Tracheae, 170 ; of Arachnida, 

 200 ; of Myriapoda, 206 ; of 

 /wseeta, 213 



Trachearia (Arachnida), 200 



Trachyderma, 168 



Trachynema, 87 



Trachynemidce, 87 



Transformation, 31 

 T 



Trematis, 248 



Trematoda, 141 ; general cha- 

 racters of, 147 ; develop- 

 ment of, 147 ; habitat of, 

 148 



Tremoctopus, 281 ; reproduc- 

 tion of, 273 



Triarthra, 157 



Trichina, 152 



Trichocysts, 63 



Tndacna, 256 



Tridacnidce, 255, 256 



Trigonia, 256 



Trigoniadce, 255, 256 



Trilobita, 177, 185 ; structure 

 of the crust of, 186 ; distri- 

 bution in time, 196 



Triton, 265 



Tritonia, 267 



Tritoniad<je, 264, 267 



Trochoceras, 280, 282 



Trochoid shell of Foramini- 

 fera, 49 ; shell of Gastero- 

 poda, 261 



Trochus, 266 



Trophi of Insects, 210, 212 



Trophosome, 26, 69 



Truncated sheUs, 230 



Tubicola, 164 ; development of, 

 165 ; distribution of, in time, 

 168 



TuUfex, 164, 168 



Tubiporidce, 107 



Tubularia, 74, 76 



Tubularida, 71 (see Corynida) 



Tubulosa, 105, 119, 120 



Tunicata, 232 ; characters of, 

 240 ; respiratory process of, 

 242 ; circulation of, 242 ; 

 reproduction of, 243 ; homo- 

 logies of, 243 ; divisions of, 

 243 ; distribution of, in 

 space, 249 ; in time, 249 



Tunics of Ascidians, 240, 241 



Turbellaria, 141 ; characters 

 of, 148 ; divisions of, 148 



Turbinated shells, 261 



Turbinidce, 263, 266 



Turbo, 266 



Turrilepas, 196 



Turrilites, 280, 281, 282, 284 



Turritella, 266 



TurritellidoB, 263, 266 



Tylenchus, 153 



Tylodma, 267 



Type, morphological, 13 



Umbilicated shell of Gastero- 

 poda, 261 

 Umbo, 252 

 Umbrella, 267 



Umbrella of Lucernarida, 87 

 Unio, 256 



Unionidce, 255, 256 

 Uraster, 130, 140 



Vacuoles, of Protozoa, 44 ; of 



Infusoria, 60 

 Vaginicola, 63 

 Vaginulus, 267 



