INDEX 



Follicle-stimulating; hormone, 122 



Follicular fluid, 130 



Folsom man, 644 



Folsom points, 644, 645 



Food, 29-35, 54, 70, 605; absorption of, 74- 

 76; digestion of, 70-74; storage of, 76-79; 

 transport of, 76-79 



Food chains, 605 



Food relations, in communities, 605-609 



Food vacuoles, in Amoeba. 228, 230; in Hydra, 

 288; in Paramecium, 248, 253 



Food webs, 605, 606 



Foot, of burrowing bivalves, 379-380; of 

 chiton, 382; of pelecvpods, 370; of snail, 

 382, 385; of squid, 389 



Foraminifera, 236, 263; shells of, 236, 238; 

 skeleton of, 527 



Formative cells, in planarians, 322, 323 



Fossil record, incompleteness of, 622; of an- 

 cestry of man, 638-646; of annelids, 396; of 

 birds, 576; of brachiopods, 363; of cephalo- 

 pods, 388; of coelenterates, 286; of mam- 

 malian origins, 582; of mollusks, 393; of 

 Protozoa, 230, 236, 263; of sponges, 273 



Fossils, nature and formation, 620 



Fox, 580, 599 



Fox snake, 573 



Fraternal twins, 209 



Free energy, 36, 37 



Free radicals, 207 



Frog, brain, 86; chromosomes, 42; circula- 

 tory system, 52; development of, 149, 165; 

 heart, 53; nephron, 58; nervous system, 

 88; retinal rod and cone, 107; tadpole, 

 155, 169, 567 



Frogs, 541; and toads, 565 



Fronloma, 257 



Fructose, 26, 77 



Fruit flv, temperature and development of, 

 595 



FSH, 122 



Funiculus, 359 



Galactose, 77 



(ialano, 585 



Galapagos Islands, 567 



Gall bladder, 72 



Gallstones, 84 



Galton, Sir Francis, 173 



Gametes, 134, 141, 530 



Gametocvtes, malaria, 246, 247; Mnnocyshs, 

 245 



Gametogenesis, 134 138, 135; in Hydra, 298 



Gamma globulin, 64, 122 



Ganglia, 296, 523 



Ganglion, 69, 89, 96; dorsal root, 98; para- 

 sympathetic, 1 15; .sympathetic, 115 



Gar pike, 558 



Gas exchange, 79; in a.scidians, 547; in 

 Branc/iinslnma, 552; in cravfish, 432; in 



earthworm, 516; in flatworms, 516; in 



Hydra, 516; in lungfishes, 558; in Thynne, 



505 

 Gas transport, 79 

 Gastraea Theory, 313 

 Gastric glands, 61, 71 

 Gastric juice, 71 

 Gastric mill, of crayfish, 430 

 Gastrocoel, 151, 368 

 Gastrodermis, of coelenterates, 284; of hydra, 



287, 288; of planarians, 324 

 Gastropoda, 216, 369, 382-387, 533 

 Gastrotricha, 216, 615 

 Gastrovascular cavity, of coelenterates and 



ctenophores, 513; of hydra, 293 

 Gastrozooids, of Physalia, 303 

 Gastrula, 151; evolutionary significance, 226, 



313 

 Gastrula cavity, 151 

 Gastrulation, 151 

 Gemmules, 281 



Gene strings, 618; see also Genonemata 

 Genes, 39, 43, 165, 183, 197, 594; linear 



order of, 190; mutation of, 205 

 Genetics, 8, 172; and animal breeding, 637; 



contribution to theory of evolution, 651 

 Genital system, see Reproductive svstem 

 Genome, 195 



Genonemata, 21, 39, 43, 194, 197 

 Genotype, 176 

 Geographic barriers, 631 

 Cieographic distribution, 619, 631 

 Geologic column, 617 

 Geologic distribution, 619 

 Geologic time scale, 617; and evolution of 



horses, 628 

 Germ balls, of Clonorchis, 330 

 Germ cells, 50, 128, 268, 647; differentia- 

 tion of, 133-139; in hydra, 292 

 Germ layers, 151; fate of, 158 

 Germ ring, 150, 151 

 German measles, 164 

 Germany, and fossil birds, 574 

 Gestation, 124 



Giant fibers, of annelid nerve cord, 524 

 Giant salamander, see Me^alohalrac/ius 

 Giant squids, 392 

 Giant tortoi.se, 567 

 Gibbon, 586, 638 

 Gigantism, 1 18 

 Gill clefts, 155 

 Gill slits, 155, 5.54 

 Gills, 54, 155; and salt regulation, 601; of 



aquatic chelicerates, 517; of crayfish, 429; 



of Limuliis, 481; of marine gastropods, 385; 



of Aedurns, 564; of pelec\pods, 372; of 



squid, 389 

 Gipsv moth, 613 

 Giraffe, 647 

 Glacial Period, 621 



690 



