800 



INDEX 



Heteronemertini, 288, 291* 



Heleronereis, 430, 439 



Heteropoda, 714*, 719, 720, 735, 736 



Heterotrichous, 94*, 96 



Hexacanth embryo, of Tcenia, 246 : 

 Cestodes, 275 



Hexaetinsllida, 113*, 122, 124, 127 



Hexactinice, 194, 198 



Hexarthra, 322, 323, 325, 328 



Hinge -ligament, 665 



Hinge-line, 354, 665 



Hinge-teeth, 354, 665 



Hippa, 555, 575, 589 



Hippurites, 682, 683 



Hirudinea, 429, 494 : Example, 494 : 

 Distinctive characters and classifica- 

 tion, 503 : General organisation, 505 : 

 Form and size, 505 : Setse, 505 : 

 Proboscis, 505 : Enteiic canal, 505 : 

 Blood-vessels, 505 : Respiratory or- 

 gans, 506 : Nephridia, 506, 507 : 

 Nervous syst3m, 507 : Sense organs, 

 507 : Reproductive orsrans, 507 : 

 Development, 508, 509: Habits, 

 distribution, &c., 509, 510, 512 



Hirudinidce, 504* 



Hirudo, 503, 504, 507, 510 



Hirudo australis, 494, 498, 499 



HIRUDO MEDICINALIS, 494 : External 

 characters, 494, 495 : Body-wall, 

 496 : Muscular system, 496, 497 : 

 Alimentary organs, 497, 498 : Ex- 

 cretory system, 498, 499, 500 : Blood- 

 system, 500, 501 : Nervous system, 

 501 : Sense organs, 501, 502 : Re- 

 productive organs, 502, 503 : De- 

 velopment, 503 : Systematic posi- 

 tion, 504 



HIRUDO QUINQUESTRIATA See H. 



MEDICINALIS 



Hirudo fsanguisugct, 510 



Histology, 3* 



Histriobdellea, 330, 331, 332, 512 



Holarctic region, 9* 



Holoblastic segmentation, 23* 



Holophytic nutrition, 67*, 70, 75, 80 



Holothuria -See Sea-cucumber 



Holothurian See Colochirus 



Holothuroidea : Example, 393 : Dis- 

 tinctive characters and classifica- 

 tion, 404 : General form, 407 : Modi- 

 fications of form, 414 : Coelome, 416 : 

 Ambulacral system of vessels, 416 : 

 Blood-vascular system, 417 : Hsemal 

 system, 418 : Axial organ, 419 : 

 Enteric canal, 419 : Respiratory 

 trees, 419 : Cuvierian organs, 419 : 

 Nervous system, 420 : Reproductive 

 organs, 4*20 : Development, 421 : 

 Ethology, 424 



Holotrichous, 91, 94*, 97 



Holozoic nutrition, 67*, 70, 80 



Homalogaster, 253 



Homarus, 555, 585 



Homoccela, 113* 



Hood, 756* 



Hook-headed worms, 293 



Hoplocarida, 555* 



HORMIPHORA PLUMOSA, 208 : External 

 characters, 208, 209 : Enteric sys- 

 tem, 210, 211 : Cell-layers, 212, 213 : 

 Nervous system, 213 : Sense organs, 

 213 : Reproductive organs, 214 : 

 Development, 214, 215, 216, 217 : 

 Systematic position, 218 



Host, of parasite, 86 : intermediate, 89 



House-flies, 602, 619 



Hyaline cartilage, 28* 



Hyalonema, 122, 127 



Hyalosphenia, 49 



Hybrids, 2* 



Hydatids, 278* 



Hydatina, 322, 324 



Hydra, 134- 147, 148, 153, 166, 167, 258 



Hijdractinia, 145, 146, 148, 149, 166 



Hydranths, of Obelia, 130*, 149 



Hydrocoele, 383 



Hydrocorallina, 143*, 156, 157, 158, 

 159, 166 



Hydroctena, 225 



Hydroids, naked - budded, 144* : 

 covered-budded, 144* 



Hydropkilus, 634, 635 



Hydrophyllia, of Halistemma, 160, 162* 



Hyclrorhiza, 130* 



Hydrospires, 405* 



Hydrotheca, of Obelia, 130*, 131, 166 



Hydrozoa, 12iJ* : Example, 129 : General 

 structure and classification, 141 : 

 Alternation of generations, 141 : 

 Systematic position of example, 143 : 

 General remarks on, 166 



Hydrula, 140, 141*, 153, 227 



Hymenoptera, 621*, 624, 626, 627, 631, 

 634, 637 



Hyperia, 554 



Hypoblast, 24* 



Hypodermic impregnation, 327, 508 



Hypopharynx, 627 



Hypostome, of Obelia, 130* 



Hypotriehous, 94*, 96 



I 



CIfNEUMON, 62], 636 



Idmonea, 340 

 Idotea, 554 

 Illoricata, 322* 

 Imaginal discs, 635 

 Imago, 634 

 Impregnation, 21* 



Impregnation, hypodermic, 327, 508 . 

 Inarticulata, 359*, 360, 361, 3<>2 

 Incurrent canals, of Sponges, 108, 109*, 

 110, 118 



