798 



INDEX 



Flagellate canals, of Sponges, 108. 109*, 

 110, 119 



Flagellate cells, 110*, 119 



Flagellulge, 51*, 56, 60, 61, 63, 67, 69, 

 71, 80, 81, 82 



Flagellum, 25*, 69, 70, 71 : of Astacus, 

 531 



Flame-cells, 235, 263, 264 



Flat-worms See Platyhelminthes 



Fleas, 620, 625, 636 



Flies, 514, 602 



Float, 160, 161* 



Floscularia, 321, 323, 324, 325 



Flustra, 340 



Folliculina, 96 



Food vacuole, of Actinophrys, 59 : 

 Paramvcium, 92* 



Food-yolk, 31 



Foot, of Anodonta, 664 : Pelecypoda, 

 683 : Amphineura, 695 : Triton, 705, 

 706 : Gastropods, 719 : Sepia, 739, 

 740 : Nautilus, 756 : Cephalopoda, 

 768 



FoQt -gland, 348 



Foramiaifera, 48* : General structure, 

 51, 52, 53, 54 : Skeleton, 53, 54, 55, 

 56 : Protoplasm, 55, 56 : Dimor- 

 phism, 56*, 57 : Reproduction, 56 : 

 Distribution, 58 



Forcipulata, 402* 



Forcipulate pedicellaria?, 370* 



Formica rufa, 636 



Fossettes, 577* 



Fossils, 7* 



Fossula, 208 



Fredericella, 341 



Fresh-water Crayfish, 527 



Fresh -water Mussel See Anodonta 



Fresh-water Sponges, 126, 127 



Fresh -water Worms, 429 



Fritillaria, 231 



Frondicularia, 54 



Frontal suture, 590* 



Fulcrum (of Rotifera), 319 



Furigia, 203 



Funiculus, 336*, 344 



Funnel, 770 



Funnel folds, 770 



G. 



a 



ALATHEA, 555 

 Galea, 605 

 GaUodes, 645, 647 

 Galeolaria coespitosa, 457 

 Gall-flies, 621, 632 

 Gall -insects, 632 

 Galls, 632* 

 Gametes, 50*, 78 : of Flagellata, 76, 



79* : Sporozoa, 82, 83 

 Gametocytes, 82, 85*, 88, 89 

 Gammarus, 554, 569 



Gamobium, 141*, 175 



Gamogenesis, 22* 



Ganglia, 38, 238 



Gastral cortex, 109, HI*, 120 



Gastric filaments, of Aurelia, 171* 



Gastric mill, 578 : of Astacus, 535 



Gastric ostium, 111* 



Gastric ridges, of Aurelia, 172* : 

 pouches, 169* 



Gastrodes, 221, 223 



Gastrolith, 536* 



Gastrophilus equi, 619, 620 



Gastropoda, 663, 702* : Example, 702 : 

 Distinctive characters and classifica- 

 tion, 713 : Systematic position of ex- 

 ample, 715: General organisation, 

 715 : External features, symmetry, 

 &c., 715: Shell, 717: Foot, 719: 

 Head, 720 : Mantle, 722 : Respira- 

 tory organs, 722 : Osphradium, 724 : 

 Digestive organs, 724 : Heart, 725 : 

 Nervous system, 725 : Organs of 

 special sense, 726: Excretory organs, 

 728 : Reproduction, 728 : Develop- 

 ment, 729, 730, 731, 732, 733, 734, 

 735 : Ethology and distribution, 735 : 

 Relationships', 736 : Appendix, 736 



Gastropores, of Millepora, 157* 



Gastrotricha, 317. 328*, 329 



Gastrozooicls, 164, 199 



Gastrula, 24* 



Gastrulation, 24* 



Gelasimus, 576, 586 



Gemmules, 112, 122* 



Gense, 604* 



Generic, 1* 



Genital cloaca, 245* : rachis, 378, 421 : 

 stolon, 378, 421 : plates, 389 : bursse, 

 420 : operculum, 640* 



Genital system See Reproductive sys- 

 tem 



Genus, 1* 



Geological distribution See Distribu- 

 tion, geological 



Geoplanidcr, 249 



Gephyrcea, 490 



Germarium, 236*, 265, 267 



Germinal bands, of Clepsine, 509 : of 

 Peripatus, 597 



Germinal disc, 775 



Germinal lay^r=i, 24* 



Germinal spot, 20*, 21, 31 



Germinal vesicle, 20*. 21 



Germ-vitellarium, 265 



Giant Clam, 692 



Giant fibres, 466 



Giant nerve -cells, 466 



Giqantorhynchus, 307, 308, 309, 310 



Gill-cover, of Astacus, 528 



Gills,' 36* See Respiration 



Gizzard, 33 



Glabella. 590* 



Glands, 26* 



