INDEX 



705 



Honniphora plumosa, 194, 194 



Hormones, 131 ; 138, 344, 440 



Houses, of Larvacea, 679 ; of Pro- 

 tozoa, 12; of Pterobranchia, 662 



Hyalonema, 126 



Hyaloplasm, 12 n. 



Hydatid cyst, 229 



Hydatina, 240, 241 ; senta, 238, 239 



Hydra, 162; 48, iii, 128, 146, 147, 

 149 ; attenuata, 148 



Hydractinia, 164 



Hydranths, 154, 155, 158. See also 

 Polyps of Hydrozoa 



Hydratuba, 178 



Hydrida, 154. See also Hydra 



Hydrocoele, see Water vascular 

 system 



Hydrocoraliinae, 165; 154 



Hydroids, see Hydrozoa 



Hydrophyllium, 166 



Hydropsyche, 487 



Hydruptila maclachlani, 487 



Hydrorhiza, 154 



Hydrospires, 659 



Hydrothecae, 155, 162, 164, 172 



Hydrozoa, 153, 163 



Hydrurus, 50; 51 



Hylatoma berberidis, 458 



Hylobius, 256 



Hymenolepis nana, 230 



Hymenoptera, 495 ; 430, 456, 501 



Hymenostomata, see Vestibulata 



Hyper mastigina, 65, 67 



Hyperparasitism, by Cryptoniscus, 

 398; by Hymenoptera, 502 



Hyperpharyngeal band, 673 



Hypobosca, 512 



Hypobranchial space, 409 



Hypoderma lineatum, 512; bovis, 

 510 



Hypopharynx, 428; 463, 483, 506 



Hypostoma, see Labrum 



Hypostome, 534 



Hypotricha, 11 1; 104 



Icerya purchasi, 446, 495 

 Ichthyophthirius, 107 

 Ideal malacostracan, 387 

 Ideal mollusc, 544 

 Idiochromatin, 26 

 Idotea, 398 



Ileum, see Small intestine 

 Imaginal discs, 459 

 Imperforate Foraminifera, 75 



Incisor process, 387 



Indirect wing muscles, 430 



Infero-marginal ossicles, 634 



Inhalant canals, 119 



Inhibition, 138 



Ink sac, 591 



Inostemma, 502 



Insecta, 425 ; 308 



Instar, 454 



Intercalary segment, 418, 420, 422, 



425 

 Interlamellar concrescences, 574; 



septum, 585; spaces, 574 

 Internal environment, 3 n. 

 Internal gills, see Stewart's organs 

 Internal longitudinal bars, 672 

 Internal madreporite, 627 

 Internal medium, 132; 3 n. See also 



Blood 

 Internal sac of Polyzoa, 6ii 

 Internal skeleton, of Alcyonaria*, 



183-6 (passim) ; of Crustacea, 340; 



of Echinodermata*, 626, 634, 638, 



640, 643, 650, 656 ; of Metazoa, 1 30 ; 



142; of Porifera, 118, 121, 123; of 



Protozoa, 7, 12, 17; of Triplo- 



blastica, 142 

 Interradial mesenteries, 174 

 Interradii of Echinodermata, 623 

 intertentacular organ, 606 

 Intestine, see Alimentary canal 

 Intracellular body cavity, 245 

 Intracellular digestion, 130; 147, 206, 



208, 240, 534, 559, 578 

 Invertebrata, i ; 2 

 Ips, 256 



Irregular echinoids, 647 ; 625 

 Ischiopodite, 336 

 Isogamy, 31 ; 46, 56, 74, 88. See also 



Gametes 

 Isopoda, 395 

 Isoptera, 469 

 Isospores, 80 

 luliis, 422; 418; terrestrisy 422, 423 



jfapyx, 463 



Jaws, of Arthropoda, 308, 309; see 



also Mouth parts ; of Chaetognatha. 



"618 ; of Echinoidea, 645 ; of Helix, 



557; of Onychophora, 308, 318; 



of Sepia (beak), 594 



Jelly, of Coelenterata, see Structure- 

 less lamella; of Porifera, 118, 123 



Jugal lobe, 429 



