678 



INVERTEBKATA 



Haled urn, 62 



Haliotis, 301, 304, 320 ; metamorphosis of 



larva of, 305 

 Hatschek's nephridmm, formationof, in larva 



of Amphioxus lanceolatus, 600 

 Hatschek's pit, formation of, in larva of 



Amphio.vus lanceolatus, 596 

 Head blastema, formation of, in Xephelis, 



162 ; in Phascolosoma, 375 ; in Poly- 



gordius appendiculatus, 147 

 Head of spermatozoon, definition of, 7 

 Head-cavities, formation of, in larva of 



Amphio-i'iis hi/iceolatus, 595 ; in Sagitta 



bipunctata, 431 

 Head-kidney of New England Tornaria, 



formation of, 577 



Head-pouch of larva of Muscidae, 278, 279 

 Head - segment of larva of Tercbratiilinn 



septentrionalis, 410 

 Head-shield in Astacus, 185 

 Head-vesicle of embryo of Dnio, 351 

 Heart, formation of, in Agelena, 229 ; in 



Astacus, 187 ; in dona intcstinalis, 626 ; 



in Donacia, 257 ; in Dreissensia, 344 ; 



in Liinulus, 256 ; in Loliyo, 362 ; in 



PaluJina, 314 ; in Peripatus capensis, 



174 ; in Cyathozooid of Pyrosoma, 634 ; in 



Scorpion, 241 ; in New England Tornaria, 



575 



;/</,>, yolk-sac of, 369 

 Hemiaspis, 239 



Hemichorda, 568 ; development of, 569-586 

 Hemimetabola, 245, 277, 287, 288 

 Hemiptera, 245, 277 

 Heredity, Weismann's theory of, 12 

 Hermann's fluid, composition of, use of, 33 

 Hermaphrodite, definition of, 2 

 Hermelliformia, 128 

 Heterochromosome, 14 

 Heterochrouy, 608 ; definition of, 46 ; in 



development of Cephalopoda, 370 

 Heterocoela, 37 

 Heteronemertini, 118 ; development of, 118- 



126 



Hexactinellida, 37 ; development of, 43 

 Hexactiniae, 53, 83, 86, 87 

 Hexapoda, 285 



Hieraciinit, asexually reproduced, 18 

 Hind-foot, formation of, in Loligo, 357 

 Hirndinea, 128 ; development of, 159-163 

 Histogenetic plasm, definition of, 13 

 Histolysis of Cyphonautes larva in meta- 

 morphosis, 394 

 Holoblastic, definition of, 26 

 Holometabola, 245 

 Holothuria tubulosa, 530 ; development of, 



541 

 Holothuroidea, 287, 456, 464, 545, 560, 



564, 565, 585, 656; pupa of, 28; develop- 

 ment of, 529-544 

 Homarus, 178, 191, 213 

 Homocoela, 37 



Hooks, disappearance of, in PlMscolosoma 

 379 ; formation of, in arms of 



Ophiothrix fray His, 498 ; in Phascolosoma, 

 379 ; in Kayitta bipunctata, 433 



Hoplocarida, 177 



Hormones, 652 



Horse-shoe Crab, 221 



Hybrids of Echinus esculentus and Echi no- 

 card i um cordat.um, 523 ; of Echinus escu- 

 lentus and Echinus miliaris, 523 



Hydra, 63, 64, 69, 70, 88, 383 ; egg of, 27 



Hydra-tuba, 70, 79, 80 



Hydrida, 53 



Hydrocoele, formation of, in embryo of 

 Antedun rosacea, 547 ; in larva of 

 Asterias, 466 ; in larva of Asterina 

 gibbosa, 474 ; in larva of Oribrella oculata, 

 481 ; in larva of Echinus esculentus, 510 ; 

 in larva of Ophiothrix fragilis, 491 ; in 

 larva of Ophiura brcvispina, 501 ; in 

 Solaster endeca, 481 



Hydroides, 313 



Hydromedusae, 53, 62, 64, 66, 67, 69, 72, 

 98, 126 



Hydrophyllium of Siphonophora, 66 



Hydrothecae, definition of, 62 



Hydrozoa, 53 78, 79, 96, 161, 659, 661 ; 

 development of, 54-67 ; development com- 

 pared with that of Scyphozoa, 74-76 



Hylodes, development of, 22 



Hymenoptera, 245, 266, 386 



Hyocrinus, 559, 560 



Hypertonic solutions, use of, 17, 18 



Hypogastric coelomof Asterina gibbosa, 475, 

 480 



Hypopharynx, formation of, in Donacia, 252 



Hypophorella e.'.'pansa, larva of, 394 



Hypophysial canal, formation of, in larva 

 of simple Ascidian, 622 ; in blastozooid 

 of Urochorda, 639 



Hyposphere in larva of Polygordiiis, 140 ; 

 disappearance of, in larva of Polygon! ins 

 appendiculatus, 149 



Id, definition of, 13 



Iiliochromosome, 14, 15 



Idiosome of spermatozoon, definition of, 7 



Ilyanassa, 332 



Imaginal disc for compound eye of Dytiscus, 



275 ; for adult oesophagus in Polygordiiix 



appendiculatus, 149 

 Imaginal discs in larva of Galerucetta ulini, 



267, 268 ; in larva of Muscidae, 278 ; in 



Pilidium larva, 122 

 Imaginal pouches for wings and legs in 



Muscidae, 279 

 Imaginal ring for proctodaeum of larva of 



Muscidae, 279 ; for salivary glands of 



Muscidae, 279 ; for stomodaeum of larva 



of Muscidae, 279 



Imago of Donacia, 260 ; of Echinus escu- 

 lentus, 517 ; of Galerucella ulmi, 268 

 Immersed embryonic area in segmenting egg 



of Lepidoptera, 266 

 Inbreeding, definition of, 18 

 Indeterminate cleavage, definition of, 416 



