818 



INDEX 



Phoronis, 357 : Magdlania, 362 : As- 

 terias, 382 : Sea-urchin, 399, 400 : Sea 

 cucumber, 403, 404 : Antedon, 407 

 Echinodermata, 428 ; Xereii<, 442 

 Lumbrimis, 457 : Chsetopoda, 475 

 Sipuncidus, 493, 494 : Gephyrea, 498 

 Hirudo, 409, 410: Hirudinea, 518 

 Apus, 532, 533: Aaacus, 548: Crus- 

 tacea, 593 : Peripatus, 608 ; Myria- 

 poda, 617: Periplaneta, 624, 625 ; In- 

 secta, 640, 641 : Scorpion, 656, 657, 

 658 : Arachnida, 667 : Anodonta, 684, 

 686 : Pelecypoda, 704 : Aniphineura, 

 715 : Triton, 726, 727, 728 : Gastro- 

 poda, 744 : Scaphopoda, 757 ; Sepia, 

 763 ; Nautilus, 786 ; Cephalopoda, 797 



Dimorpha, 70, 71 



Dimorphism, in Foraminifera, 56 : in 

 Radiolaria, 63 : in Flagellata, 76 : in 

 Ciliata, 97, 98 



Dimorphism, sexual, 40* 



Dimorphograptus, 167 



Dimyaria, 290 



Dinobryon, 71, 74 



Dinoflagellata, 69* : Characteristic fea- 

 tures, 78, 79 



Dinophilea, 336, 337 



DinophiluB, S2A, 337 



Dioecious, 40*, 139* 



Diophrys, 92, 94 



Diphyes, 164, 165 



Dipleurula, 432* 



Diplomita, 71 



Diplopoda, 615*, 617, 618 



Diplozoon, 111 



Diptera, 634*, 638, 639, 640, 644, 646, 

 647, 649, 651, 653 



Directive mesenteries, of Sea-anemone, 

 189 



Discina, 189, 366, 368 



Disc, 185* 



Disc-jellies, 182 



Discoidal segmentation, 659 



DiscomeduBse, 176*, 182, 183, 189 



Discorbina, 53 



Discosoma, 208, 210 



Discralium lanceolaliwi, 285 



Dissepiments, 205* 



Distinctive characters — See Classification 



Distomidw, 253*, 254 



Distomum, 265 



DiSTOMUM HEPATICDM, 240 — See 



Fasciola hepatica 



Distomum rathousii, 285 



Distribution, 8: of Sponges, 126: Hydro- 

 coroUinai, 159 : Scyphozoa, 184 : Ac- 

 tinozoa, 209 : Ctenophora, 224 : Platy- 

 helmiuthes, 283 : Ectoproota, 353 : 

 Brachiopoda, 371 : Gephyrea, 502 ; 

 Hirudinea, 524: Onychophora, 612: 

 Pelecypoda, 710 : Amphineura, 720 : 

 Gastropoda, 755 : Cephalopoda, 803 



Distribution, geographical, § 



Distribution, geological, 8* : of Forami- 

 nifera, 56 : Sponges, 126 : Corals, 210 : 

 Brachiopoda, 371 : Cha?topoda, 488 : 

 Insecta, 652 : Arachnida, 673 ; Cephalo- 

 poda, 803 



Distribution, vertical, 8* 



Divaricators, 364 



Dochmius duodenalis, 306 



DocoglOBsa, 733*, 756 



Doctrine of descent, 6 



JJonax, 706 



Doris, 734, 742 



Doris (Archidoris) luherculata, 739 



Dorsal, 42* 



Dorsal cirri, of Antedon, 405 



Dorsal organ, of Apiis, 527 



Dorsal pores, of Earthworm, 455 



Dragon flies, 633, 644 



Drepanophorus, 289 



Drilophaga, 335 



Dromia, 601 



Ductus ejaculatorius, 302 



Dytiscus, 645 



E. 



Jak 39* 



Ear-shells, 733 



Earthworm — See Lnmhriciis 



Earthworms, 439 



Earwigs, 636 



Ecdyses, of Apiis, 539 



Echiniidce, 414* 



Echinoderes, 319, 320 



Echinoderidie, 319, 320 



Echinodermata, 375* : Examples, 375, 

 393, 401, 405 : Distinctive characters 

 and classification, 410 : Systematic 

 position of examples, 414 : General or- 

 ganisation, 415 : General form and 

 symmetry, 415 : Systems of plates, 417 : 

 Modifications of form, 418 : Co;lome, 

 425 : Ambulacral system, 425 : Blood- 

 vascular system, 426 ; H.-emal system, 



427 ; Axial organ, 428 : Enteric canal, 



428 : Nervous system, 429 ; Sexes, 429 : 

 Development and metamorphosis, 430 : 

 Echinop«dium, 432: Ethology, &c., 

 434 : Self-mutilation and regeneration, 

 435: Affinities, 436 



EcMnoidea, example, 393 : Distinctive 

 characters and classification, 412 : 

 Apical system, 417 : Modifications of 

 form, 421 : Dermal branchiae, 425 : 

 Stewart's organs, 425 : Ambulacral 

 system, 426 : Blood-vascular system, 



427 : Hajmal system, 427 : Axial organ, 



428 : Enteric canal, 428 : Nervous 

 system, 429 : Reproductive organs, 429 ; 

 Development, 430 : Ethology, 434 



Echinopcedium, 432* 

 Echinorhynchiia, 312, 313, 314, 31? 



