INDEX 



795 



DISTOMUM HEPATICUM, 236 See 

 Fasciola hepatica 



Distomum rathousii, 280 



Distribution, 8 : of Sponges, 125 : 

 Hydroco rollinse, 159 : Scyphozoa, 

 183 : Actinozoa, 207 . Ctenophora, 

 223 : Platyhelminthes, 279 : Ecto- 

 procta, 346 : Bracaiopoda, 364 : 

 Sipunculoidea, 490 : Hirudinea, 510 : 

 Onychophora, 597 : Pelecypoda, 

 692 : Amphineura, 701 : Gastropoda, 

 735 : Cephalopoda, 779 



Distribution, geographical, 8 



Distribution, geological, 8* : of Fora- 

 minifera, 58 : Sponges, 125, 126 : 

 Corals, 208 : Brachiopoda, 364, 365 : 

 Chsetopoda, 477 : Insecta, 637 : 

 Arachnida, 656 : Cephalopoda, 780 



Distribution, vertical, 8* 



Divaricate r?, 357 



Dochmius duodenalis, 300, 301 



Docoglossa, 714*, 736 



Doctrine of descent, 6 



Donax, 687 



Doris, 715, 719, 723 



Doris (Archidoris) tuberculata, 719 



Dorsal cirri, of Antedon, 397 



Dorsal organ, of Apus, 515* 



Dorsal pores, of Earthworm, 445 



Dorsal surface, 43* 



Dragon flies, 618, 629 



Drepanophorus, 285 



Drilophaqa, 328 



Dromia, 586 



Ductus ejaculatorius, 296* 



Dytiscus, 630 



E. 



E 



IAR, 40* 



Ear-shells, 714 



Earthworm See Lumbricus 



Earthworms, 429 



Earwigs, 621 



Ecdyses, of Apus, 526 



Echiniidce, 406* 



Echinoderes, 314 



Echinoderidce, 314 



Echinodermata, 368* : Examples, 368, 

 386, 393, 396 : Distinctive charac- 

 ters and classification, 401 : Sys- 

 tematic position of examples, 405 : 

 General organisation, 406 : General 

 form and symmetry, 406 : Systems 

 of plates, 409 : Modifications of 

 form, 409 : Coelome, 416 : Ambula- 

 cral system, 416 : Blood-vascular 

 system, 417 : Haemal system, 418 : 

 Axial organ, 419 : Enteric canal, 



419 : Nervous system, 420 : Sexes, 



420 : Development and metamor- 

 phosis, 421 : Echinopsedium, 422 : 



Ethology, &c., 424 : Self -mutilation 

 and regeneration, 425 : Affinities, 426 



Echinoidea, 368, 403* : Example, 386 : 

 Distinctive characters and classifi- 

 cation, 403 : Apical system, 409 : 

 Modifications of form, 409 : Dermal 

 branchiae, 416 : Stewart's organs, 

 416 : Ambulacra! system, 416 : 

 Blood-vascular system, 417 : Haemal 

 system, 418 : Axial organ, 419 : 

 Enteric canal, 419 : Nervous system, 

 420 : Reproductive organs, 420 : 

 Development, 421 : Ethology, 424 



Echinopcedium, 422* 



Echinorhynchus, 307, 308, 309, 310 



ECHINUS, 386 : General external fea- 

 tures, 386, 387, 388 : Corona, 388 : 

 Aristotle's lantern, 389, 390 : Ner- 

 vous system, 390 : Ambulacral sys- 

 tem, 390, 391 : Enteric canal, 391, 

 392 : Coelome, 392 : Blood-vascular 

 system, 392 : Reproductive organs, 

 392 : Development, 392 : Syste- 

 matic position, 406 



Echiurida, 429, 461, 479*, 480, 481, 482, 

 483, 484, 511, 512 



Echiurus, 479, 480, 481, 482, 483 



Ectobranchiata 406* 



Ectocyst, 334* 



Ectoderm, 24* See Body-wall 



Ectoprocta, 340*, 341 : Structure of 

 body-wall, 344 : Alimentary canal, 

 344 : Nervous system, 344 : Ne- 

 phridia, 344 : Avicularia, 345 : 

 Vibracula, 345 : Reproduction and 

 development, 345 : Ethology and 

 distribution, 346 



Ectosarc, 46* 



Edriasteroidea, 405*, 426 



Edwardsia, 198, 200, 224, 227 



Eggs See Development 



Eimeria, 86 



Ejaculatory duct, 239 



Elasipoda, 404*, 419, 425 



Eledone moschata, 774 



Elephant's tusk shells, 736 



Eleutherozoa, 401* 



Elk-horn coral, 156, 157 



Elytra, of Polychseta, 460 : Cock- 

 roach, 606 : Coleoptera, 620, 625 



Embiidse, 617* 



Embryology, 3* See Development 



Empis, 629 



Emulsions, 35* 



Encystation, 45*, 61 



Endites, 518 



Endocyst, 334* 



Endoderm, 24* 



Endoderm-disc, of Aslacus, 545 



Endoderm lamella, 137* 



Endogastric, 755* 



Endophragmal system, of Astacus, 529 



Endoplasm, 11*, 46* 



