INDEX 



Flagellata, 45. 



Flagellum, 42, 43. 



Flame cell, 153. 



Flamingo, 590, 602. 



Flatworms, 150-168. 



Fleas, 337, 359~36o ; beach, 296, 301; 



cat and dog, 360 ; human, 360; jigger, 



360 ; rat, 360 ; snow, 338 ; water, 299, 



300. 



Flicker, 614. 



Flight, of birds, 621-622. 

 Flounder, 444, 469, 470. 

 Fly, 337, 356-359; bee, 358; black, 357 ; 



blow, 358; bot, 358, 359; caddice-, 



350; damsel-, 339; dobson-, 349; 



dragon-, 339; drone-, 359; fire-, 361; 



fruit, 359 ; Hessian, 357 ; horse-, 358 ; 



house, 358, 370; ichneumon, 364, 367; 



lace-wing, 349 ; may-, 338 ; saw-, 365 ; 



scorpion-, 349 ; stone-, 340 ; tsetse, 71, 



Flycatcher, 591, 615. 



Food, 29, 627-630 (see digestive system). 



Foot, of mollusks, 242, 244, 261, 264, 

 265, 270; rotifers, 181, 182. 



Foramen magnum, 493, 494. 



Foraminifera, 41. 



Forficulida, 342. 



Formicida, 364, 369. 



Fossil, Amphibia, 525; birds, 592, 593; 

 fish, 474; mammals, 685-687; rep- 

 tiles, 572; vertebrates, 696-701. 



Fox, 643, 651, 653. 



Fringillida, 593. 



Frog, 477-510; behavior, 506; circula- 

 , tory system, 484; development, 506; 

 digestive system, 480; economic im- 

 portance, 526; excretory system, 490; 

 external features, 478; glands, 492; 

 muscular system, 497 ; nervous sys- 

 tem, 501 ; reproductive system, 491 ; 

 respiratory system, 482 ; sense organs, 

 504; skeleton, 492. 



Frogs, 512, 517, 519-522. 



Frontoparietals, 493, 494. 



Fulica, 606. 



FuligulincK, 603. 



Fulmar, 600; Fulmarus, 600. 



Funiculus, 184. 



Funnel, 146, 147, 264, 265, 397, 399. 



Fur, bearers, 688; seal, 657. 



Furcula, 580, 581. 



Gadidce, 444, 470; Gadus, 470. 



Galerncella, 362. 



Gall, -bladder, 406, 481; -gnat, 356; 



plant, 366. 

 Caller ia, 327. 

 Galliformes, 590, 606. 

 Gallinula, 606. 

 Callus, 630. 

 Gamasidce, 380. 

 Gammarus, 297, 298, 301. 

 Gannet, 601. 

 Ganoids, 454, 694, 695. 

 Garpike, 443, 454- 

 Caster os tcidce, 444, 464; Gasterostei- 



formes, 444; Gaslcrostcus, 464. 

 Gastcroslomum, 162. 

 Gastraca, 303. 

 Gastric, filaments, 131 ; mill, 282 ; pouch, 



130. 



Gaslrophilus, 358, 359. 

 Gastropoda, 242, 243, 252-261. 

 Gastrovascular cavity, 93, 109, no, 120, 



123, 134, 135- 

 Gastrozooid, 125, 127. 

 Gastrula, 87, 88, no, 116, 507, 508. 

 Gai'ia, 589, 599; Gaviidce, 599. 

 Gavialidce, 536, 548; Gavialis, 536, 547, 



548. 



Gazelles, 671. 



Geckos, 537, 552; Geckonidcc, 537, 552. 

 Gclasimus, 297, 298. 

 Gclcchia, 356. 

 Gemmules, 98, 99. 

 Genitalia, 330. 



Genital pores, 217 (see excretory system). 

 Genus, 22. 

 Geodia, 105. 



Gcomyida, 658; Geontys, 643, 660. 

 Geonemertes, 177. 

 Geophilus, 311. 

 Geotria, 420. 

 Geotropism, 36, 57. 

 Gephyrca, 186, 187, iSS. 

 Germ-cells, 46, 47, 73, 75. 

 Germinal disk, 441. 

 Germ-layers, 88, 89, 507, 508. 

 Geryonia, 122. 

 Gestation, 641. 

 Gid, i 68. 



Gila monster, 556, 571. 

 Gill, arches, 437, 508; bars, 397, 398; 



covers, 433 ; rakers, 437, 439. 



