634 



INDEX. 



Optic nerves, 515; Semicircular 

 canals, 534; Hypobranchial groove, 

 554. 



Goat— Skull, 463. 



Gordiacea — Alimentary canal, 160 ; Ex- 

 cretory organs, 173. 



Gordius — Alimentary canal, 160; Ex- 

 cretory organs, 173 ; Generative 

 organs, 185. 



Grallatores — Optic bulb, 529 ; Pecten, 

 531. 



Gregarinse — Sensory organs, 42; Form 

 of, 76 ; Cuticular layer, 78 ; " Head," 

 80; Nutrition in, 83 ; Figure of, 87 ; 

 Eeproduction in, 87; Pseudonavi- 

 cellse, 87. 



Gymnolgemata — Cells, 139. 



Gymnophiona — Eibs, 439. 



Gymnosomata — Cephaloconi of, 326 ; Ee- 

 spiratory organs, 339. 



Gymnotus — Electric organs, 500. 



Haliotis — Epipodium, 324 ; Eranchiee, 

 337 ; Ganglionic chain, 347 ; Heart, 

 371 ; Excretory organs, 377 ; Germ- 

 gland, 385. 



Halisarca — Ectoderm, 103 ; Sexual organs, 

 119. 



Hahnaturus — Nipples, 422 ; Veins, 591 ; 

 Erectile bodies, 623. 



Harpa— Siphon, 323; Proboscis, 361; 

 Penis, 386. 



Hedessa — Casca, 268. 



HelicinEB— Shell, 332 ; Lung, 339 ; Sper- 

 matophores, 383 ; Eeceptaculum 

 seniinis, 383. 



Heliozoa — Protoplasm, 76. 



Helix— Tentacles, 326; Hremal spaces, 

 373 ; Hennaphrodite glands, 382 ; 

 Generative apparatus, 383. 



Hemiptera — Setre, 246; Wings, 248; 

 Ventral chord, 259 ; Stomach, 272 ; 

 Mid-gut, 272; Malpighian vessels, 

 277 ; Generative organs, 302 ; Testis, 

 304. 



Hermella — Tentacles, 134; Appendages, 

 136 ; Ganglia, 150 ; Vascular system, 

 170. 



Heterakis — Alimentary canal, 159. 



Heteropoda— Gelatinous tissue, 25; Shell, 

 322, 332; Foot, 324; Cutis, 328; 

 Branchiae, 338; Muscular system, 

 342; Commissures, 348; Olfactory 

 organ, 352; Eye, 354; Auditory 

 vesicles, 357; Eadula, 360; Crop, 

 361 ; Excretory organs, 378 ; Eecep- 

 taculum seminis, 385 ; Penis, 385. 



Heterotricha — Cilia, 79. 



Hippolyta — Auditory vesicles, 261. 



Hirudinea — Eespiration in, 136; Integu- 

 ment, 136 ; Dermal glands, 141 ; 

 Muscular system, 142; Muscular 

 fibres, 144; Nervous system, 149; 

 Ventral ganglia, 150; Visceral nerves 



151 ; Cup-shaped organs, 153 ; Vis- 

 ual organs, 154 ; Fore-gut, 162 ; 

 Enteric glands, 164 ; Vascular sys- 

 tem, 167; Excretory organs, 177; 

 Generative organs, 186 ; Generative 

 products, 190, Spermatophores, 191. 



Hirudo — Vascular system, 167 ; Excretory 

 organs, 177 ; Generative organs, 187. 



Histiotheutis — Eye, 355. 



Hoemopis — Mid-gut, 162; Generative or- 

 gans, 187 ; Generative products, 190. 



Holothuria — Alimentary canal, 214; PoHan 

 vesicles, 223. 



Holothurise — Integument, 207. 



Holothuroida — Ambulacra, 197; Tentacles, 

 200; Calcareous skeleton, 202; In. 

 tegument, 206 ; Internal skeleton, 

 207 ; Muscular system, 208 ; Nervous 

 system, 210 ; Sensory organs, 210 ; 

 Alimentary canal, 211, 214; " Lungs," 

 215; CcBlom,217; Blood-vessels, 218; 

 Stone-canal, 221 ; Polian vesicles, 

 222; Water-vessels, 223; Excretory 

 organs, 224; Generative organs, 226. 



Holotricha — Cilia, 79. 



Homarus — Male organs, 295. 



Hyaena — Kidney, 605. 



Hyaleidee — Foot, 324; Eespiratory or- 

 gans, 339 ; Hermaphrodite glands, 

 382. 



Hyalonema — Skeleton, 106. 



Hydra — Neuromuscular cells, 30 ; Cormi, 

 94. 



Hydrte — Generative buds, 120. 



Hydractinia — Tentacles, 93, 101 ; Buds, 

 95; Polymorphism in, 95; Tests, 104. 



Hydriformes — Muscular system, 108. 



Hydrobius — Generative organs, 303. 



Hydrochsorus — Uterus, 615. 



Hydroida — Musculature, 39 ; Tentacles, 

 93; Medusa3, 93; Buds, 95; Tests, 

 104 ; Supporting lamella, 107 ; 

 Nervous system, 109 ; Gastrovascular 

 system, 114 ; Ova, 124. 



Hydroid Polyps — Flagellate cells, 21. 



Hydromedusae — Tentacles, 101 ; Muscu- 

 lar system, 108; Marginal vesicles, 

 110; Gastric system, 115; Pigmented 

 investment of stomach, 118 ; Separate 

 sexes, 120. 



Hydrophilus — Development, 245. 



Hymenoptera — Gnathites, 246 ; Linguaj, 

 246 ; Paraglossas, 246 ; Wings, 248 ; 

 Dermal skeleton, 259; Wax organs, 

 250 ; Spinning vessels, 250 ; Ventral 

 chord, 259; Stomach, 272; Malpi- 

 ghian vessels, 277 ; Tracheal vesicles, 

 289 ; Generative organs, 302 ; Testis, 

 304. 



Hyperida— Optic nerves, 253; Auditory 

 vesicles, 261. 



Hypotricha — Cilia, 79. 



Hyrax — Dorso-lumbar vertebra, 436 ; 

 Testes, 618. 



