762 



INDEX 



Dermal cortex, 102*, 110 



Dermal pores, 347 



Dermaptera, 587 



Desmoscoletida, 296 



J)e*moscolex, 297 



Desmospongiae, 103* 



Deutomerite of Gregatrina, 77 



Development, of ycon, 113, 114: Sponges, 

 115: Obelia, 129, 130: Septdinas, 141: 

 Trachylimv, 144 : Aurelia, 160, 161, 

 162 : Sea-anemone, 179 : Hormiphora, 

 204: Dinjemida, 217, 218 : Rhopalum, 

 219 : Planaria, 225 : Liver-Fluke, 229, 

 230: Tcttnia, 236: Platyhelminthes, 

 256 : Nemertinea, 272, 273 ; Ascaris, 

 280 : Nematoda, 286, 287 : Chaeto- 

 gnatha, 295 : Bracliionus rubens, 302 : 

 Rotifera, 309: Biujnla, 317: Ecto- 

 procta, 325: Phoronin, 329, 330: 

 Brachiopoda, 341 : Asterina, 358, 359 : 

 Sea-urchin, 368 : Sea-cucumber, 372 : 

 Antedon, 377, 398: Echinodermata, 

 396, 397 : Nereis, 413, 414, 415 : Lum- 

 bricus, 425, 426: Chaetopoda, 442: 

 Gephyrea, 459, 460 : Hirudo, 475 : 

 Hirudinea, 479 : A pus, 496 : Astacus, 

 515 : Crustacea, 551 : Peripatus, 562, 

 563, 564, 565 : Myriapoda, 570 : Ptri- 

 pIa-nefa,58Q: Scorpion, 610 : Anodonta, 

 643 : Pelecypoda, 658 : Amphineura, 

 668 : Gastropoda, 698 : Scaphopoda, 

 706 : Cephalopoda, 744, 755 



Devonian, 7 



Itiastyfa, 524, 543 



JJibranchiata, 736*, 737, 738, 740, 743, 744 



Diceras, 651 



Dichyocysta, 86 



Dicyema, 216, 217, 218 



Dicyemidiv, 216, 217 



Didinium, 85 



DlDYMIUM DIFFORME, 61, 62 



Didymogrctptus, 155 



Differentiation, 21* 



Difflugia, 48 



Digenetica, 238*, 250, 253, 256 



Digestion, intracellular, 31 



Digestive glands, 31 



Digestive system, 30 



Digestive system, of Paramreritim, 86 : 

 Aurelia, 157, 158, 159 : Sea-anemone, 

 174, 175 : Hormiphora, 199, 200, 201 : 

 Planaria, 222, 223 : Liver-Fluke, 227 : 

 Platyhelminthes, 250, 251, 252: Ne- 

 mertinea, 269 : Ascdris, 278, 279 : 

 Nematoda, 283 : Cheetogndtha, 293 : 

 Brachi&vus ruben*, 300, 301 : Rotifera, 

 307 : Buynla, 315, 316 : Ectoprocta, 



- 323 : Endoprocta, 326 : Phoroniy, 329 : 

 Magellaniq, 334 : Arenas, 353 : Sea- 

 urchin, 367 : Sea-cucumber, 371, 372 : 

 A ntedon, 375 : Echinodermata, 394 : 

 -V' n /.s, 400, 407 : Lwnbrirn*, 420 : 

 Chajtopoda, 436 : tiipunnduH, 452, 



453 : Gephyrea, 457 : Hirudo, 468, 

 469 : Hirudinea, 476 : Apw, 489, 490 : 

 Abacus, 506: Crustacea, 547: Peri- 

 t>atux, 561 : Myriapoda, 569 : Peri- 

 'planet a, 576: Insecta, 592 : Scorpion, 

 607, 608 : Arachnida, 618 : Anodonta, 

 636 : Pelecypoda, 655 : Amphineura, 

 665 : Triton, 676, 677 : Gastropoda, 

 692: 'Scaphopoda, 706: Sepia, 712, 

 713, 714, 715 : Nautilus, 730, 731 : 

 Cephalopoda, 743 



Dimorplia, 66, 67 



Dimorphic zooids, of Ciliata, 89 



Dimorphism, sexual, 38* 



Dinobryon, 66 



Dinoflagellata, definition, 65 : Charac- 

 teristic features, 73 



Dinophilea, 310 



Dinophilus, 482 



Dicecious, 38 



Diophrys, 83 



Diphyes, 152, 153 



Diplomita, 66 



Diplonephridia, 439* 



Diplopoda, 567, 569, 570 



Diplozoon, 258 



Diptera, 585, 589, 596, 598, 602, 605 



Directive mesenteries, of Sea-anemone, 

 176 



Discina, 337, 339 



Discoidal segmentation, 610 



Discomedusse, 164*, 169, 170 



JDiscorbina, 53 



Discovoma, 195, 197 



Dissepiments, 192* 



Distinctive characters See Classification 



DISTOMUM HEPATICUM, 226 : General 

 features, 226 : Body-wall, 226, 227 : 

 Digestive system, 227 : Water-vessels, 

 227 : Nervous system, 228 : Repro- 

 ductive organs, 228, 229 : Develop- 

 ment, 229, 230 : Systematic position, 

 238 



Uistomum hepaticum, 265 



D. rathousii, 265 



D. sinense, 265 



Distribution, 8: of Sponges, 113: Hydro- 

 corallinee, 147: Scyphozoa, 171 4 Ac- 

 tinozoa, 196 : Ctenophora, 211 : Platy- ' 

 helminthes, 263 : Ectoprocta, 326 : 

 Brachiopoda, 342 : Gephyrea, 461 : 

 Hirudinea, 481 : Onychophora, 566 : 

 Pelecypoda, 661 : Amphineura, 670 : 

 Gastropoda, 704 : Cephalopoda, 749 



Distribution, geographical, 8 



Distribution, geological, 8 : of Sponges, 

 113: Corals, 197: Brachiopoda, 342: 

 Chretopoda, 447 : Insecta, 604 : Arach- 

 nida, 624 : Cephalopoda, 749 



Distribution, vertical, 8 



Dochmiua duodenoli*, 284 



Docoylowa, 683 



Doctrine of Descent, 6 



