762 



INDEX 



Dermal cortex, 102*, 110 



Dermal pores, 347 



I >< nnaptera, 587 



Dtam oscole c id< i j , 296 



Dexmoscohx, 297 



Lesmospongise, 103* 



Deutomerite of Gn-'/ni-tiirt, 77 



Development, of St/con, 113, 114: Spon-r-. 

 115: O'H-lla, 129, 130: Septottnce, 141: 

 Tmchyfinii-, 144: Anrdia, 160, 161, 

 162: Sea-anemone, 179: Hormiplwi-H, 

 204 : Dicyemidu', 217, 218 : Rhopalura, 

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

 230: To nin, 236: Platyhelminthes, 

 256: Nemertinea, 272,273; A*<-<cri, 

 280 : Nematoda, 286, 287 : Chteto- 

 gnatha, 295 : Brachionus rubens, 302 : 

 Rotifera, 309: Biujula, 317: Ecto- 

 procta, 325 : Phoronis, 329. 330 : 

 Brachiopoda. 341 : Asterina, 358, 359 : 

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

 Aiitedon, 377, 398 : Echinodermata, 

 396, 397 : ^treis, 413, 414, 415 : Luiti- 

 bricus, 425, 426 : Chsetopoda, 442 : 



" 1 ~ ,<-0 ARf\ . Ff ;-.;i, Jn J.7.-1 



453 : Gephyrea, 457 : Hirudo, 4(is, 

 469 : Hirudinea, 476 : Apti*, 489, 490 : 

 Axtacus, 506: Crustacea, 547: Pn'i- 

 imtiix, 561 : Myriapoda, 569 : Peri- 

 jil<in<:t<i, 576: Insecta, 592 : Scorpion, 

 607,608: Arachnida, 618 : Anodonta, 

 636: Pelecj-poda, 655 : Amphineura, 

 665 : Triton, 676, 677 : Gastropoda, 

 692: Scaphopoda, 706: Sepia, 712, 

 713, 714, 715 : Xaittilm, 730, 731 : 

 Cephalopoda, 743 



Dimorplia, 66, 67 



Dimorphic zooicls, of Ciliata, 89 



Dimorphism, sexual, 38* 



Dinobryon, 66 



Dinoflagellata, definition, 65 : Charac- 

 teristic features, 73 



Dinophilea, 310 



Dinophilus, 482 



Dicecious, 38 



Diophrys, 83 



Dijthyeft, 152, 153 



Diplomita, 66 



Diplonephridia, 439" 



TtinlnnnHa ~(V7 :i(i9 570 



Devonian, / 



Diastyli*, 524, 543 



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



.1 >'< ra.t, 651 



Dichyocysta,, 86 



Dicyema, 216, 217, 218 



Diryemidii /, 216, 217 



JJidinium, 85 



DlDYMIUM DIFFORME, 61, 62 



Didymograptiis, 155 



Differentiation, 21* 



Difflmjitt, 48 



Digenetica, 238*, 250, 253, 256 



Digestion, intracellular, 31 



Digestive glands, 31 



Digestive system, 30 



Digestive system, of Para/nifittm, 86 : 

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

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

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

 Platyhelminthes, 250, 251, 252: Ne- 

 mertinea, 269: Ascaris, 278, 279: 

 Nematoda, 283 : Chsetognatha, 293 : 

 lii-'ti-htomtn rubeii*, 300, 301 : Rotifera, 

 30": JJii</i(/i(, 315, 316: Ectoprocta, 

 323 : Endoprocta, 326 : Phoronii, 329 : 

 Maydla-iiia, 334 : Axte-ria*, 353 : Sea- 

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

 Aivtedon, 375: Echiuodermata, 394: 

 Nereis, 4<u;, 407: Lumliricii*, 420: 

 Chsetopodaj 436: Xiimn<-nlti*, 452, 



"Discosoma, 195, lav 



Dissepiments, 192* 



Distinctive characters See Classification 



DISTOMUM HEPATicu.M, 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, 

 23S 



Distommn hepyticum, 265 



D. rathousii, 265 



D. -smeH.se, 265 



Distribution, 8: of Sponges, 113: Hydro- 

 corallina-, 147 : Scyphozoa, 171 : 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: 

 Cha-topoda, 447 : Insecta, 604 : Arach- 

 nida, 624: Cephalopoda, 749 



Distribution, vertical, 8 



Dochmius i/n<id< ita/i, 284 



]Jo<wil<>**<i. (i83 



Doctrine of Descent, 6 



