626 



NDEX 



Hood of Tetrabranchiata, 527 



Hoplocampa testiidinea, 433 



Hoplocarida, see Stomatopoda 



Hormiphora plumosa, 171 



House of Larvacea, 600 



Houses of Protozoa, 8 



Hyalonema, 118 



Hyaloplasm, 8 n. 



Hydatid cyst, 202 



Hydatina, 211, 212, 213 



H. senta, 209, 210 



Hydra, 120; 104, 125-9, i40> 142, 



155, 169, 213 

 H. attenuata, 127 

 H. viridis, 170 

 Hydractinia, 142 

 Hydranths, 133, 135, 137. See also 



Polyps 

 Hydratuba, 155 

 Hydrida, 133, See also Hydra 

 Hydrocoele, see Water vascular 



system 

 Hydrocorallinae, 133; 143 

 Hydroids, see Hydrozoa 

 Hydrophyllium, 145 

 Hydropsyche, 426 

 Hydroptila maclachlani, 426 

 Hydro rhiza, 133 

 Hydrospires, 582 

 Hydrothecae, 150; 134 

 Hydrozoa, 132; 141 

 Hydrurus, 44 ; 45 

 Hylobiiis, 226 

 Hymetiolepis nana, 204 

 Hymenoptera, 432; 386 

 Hymenostomata, see Vestibulata 

 Hypermastigina, 60, 62 

 Hyperparasite, see Cryptoniscus 

 Hyperpharyngeal band, 594 

 Hypobranchial space, 366 

 Hypopharynx, 436; of Machilis, 407 

 Hypostoma, see Labrum 

 Hypostome, 462 

 Hypotricha, 104; 97 



Icerya purchasi, 394 

 Ichthyophthirius, 100 

 Ideal malacostracan, 347 

 Ideal mollusc, 471 

 Idiochromatin, 22 

 Idotea, 356 



Ileum, see Small intestine 

 Imaginal discs, 402 

 Imperforate shells, 69 



Incisor process, 348 



Indirect wing muscles, 386 



Infero -marginal ossicles, 558 



Inhalant canals, 112 



Ink sac, 517 



Insecta, 382; 271 



Instar, 399 



Intercalary segment of Chilopoda, 



375 

 Interlamellar concrescences, 499 

 Interlamellar septum, 510 

 Interlamellar spaces, 501 

 Internal gills, see Stewart's organs 

 Internal longitudinal bars, 594 

 Internal madreporite, 551 

 Internal sac of Polyzoa, 535 

 Internal skeleton, of Alcyonaria, 

 160-3; of Crustacea, 303; of 

 Echinodermata*, 550, 558, 562, 

 564-7, 573, 579; of Metazoa, 121 ; 

 of Porifera, 1 13 ; of Protozoa, 3, 8, 



14 

 Interradial mesenteries, 151 

 Interradii of Echinodermata, 547 

 Intertentacular organ, 530 

 Intestine, see Alimentary canal 

 Intracellular body ca\dt}^, 215 

 Invertebrata, i ; 2 

 Ips, 226 



Irregular echinoids, 550, 570 

 Ischiopodite, 300 

 Isogamy, 26; 27, 40, 50, 69, 83. See 



also Gametes 

 Isopoda, 354 

 Isoptera, 412 

 Isospores, 75 

 Iidus, 379; 375, 381 

 /, terrestris, 379, 380 



Japyx, 406 



Jaws, of Arthropoda, 271 ; see also 

 Mouth parts; of Chaetognatha, 

 542 ; of Echinoidea, 567 ; of Helix, 

 484; of Onychophora, 270, 282; 

 of Sepia (beak), 519 



Jelly, of Coelenterata, see Structure- 

 less lamella (Mesogloea) ; of Pori- 

 fera, III, 113 



Kakothrips rohiistus, 424 

 Karyogamy, 26 n. See also Syngamy 

 Kar^'^olymph, 8 

 Karyosome, 19 

 Keratosa, 113 



