Skeleton of hand of six mammals Figs. 343–345. Arm and hand of three anthropoids Fig. 346. Section of fish’s tail Fig. 347. Human skeleton Fig. 348. Skeleton of the giant gorilla Fig. 349. The human stomach Fig. 350. Section of the head of a rabbit-embryo Fig. 351. Shark’s teeth Fig. 352. Gut of a human embryo Figs. 353–354. Gut of a dog embryo Figs. 355–356. Sections of head of lamprey Fig. 357. Viscera of a human embryo Fig. 358. Red blood-cells Fig. 359. Vascular tissue Fig. 360. Section of trunk of a chick-embryo Fig. 361. Merocytes Fig. 362. Vascular system of an annelid Fig. 363. Head of a fish-embryo Figs. 364–366. The five arterial arches Figs. 367–370. The five arterial arches Figs. 371–372. Heart of a rabbit-embryo Figs. 373–374. Heart of a dog-embryo Figs. 375–377. Heart of a human embryo Fig. 378. Heart of adult man Fig. 379. Section of head of a chick-embryo Fig. 380. Section of a human embryo Figs. 381–382. Sections of a chick-embryo Fig. 383. Embryos of sagitta Fig. 384. Kidneys of bdellostoma Fig. 385. Section of embryonic shield Figs. 386–387. Primitive kidneys Fig. 388. Pig-embryo Fig. 389. Human embryo Figs. 390–392. Rudimentary kidneys and sexual organs Figs. 393–394. Urinary and sexual organs of salamander Fig. 395. Primitive kidneys of human embryo Figs. 396–398. Urinary organs of ox-embryos Fig. 399. Sexual organs of water-mole Figs. 400–401. Original position of sexual glands Fig. 402. Urogenital system of human embryo Fig. 403. Section of ovary Figs. 404–406. Graafian follicles Fig. 407. A ripe graafian follicle Fig. 408. The human ovum GLOSSARY Acrania: animals without skull (_cranium_). Anthropogeny: the evolution (_genesis_) of man (_anthropos_). Anthropology: the science of man. Archi-: (in compounds) the first or typical—as, archi-cytula, archi-gastrula, etc. Biogeny: the science of the genesis of life (_bios_). Blast-: (in compounds) pertaining to the early embryo (_blastos_ = a bud); hence:— Blastoderm: skin (_derma_) or enclosing layer of the embryo. Blastosphere: the embryo in the hollow sphere stage. Blastula: same as preceding. Epiblast: the outer layer of the embryo (ectoderm). Hypoblast: the inner layer of the embryo (endoderm). Branchial: pertaining to the gills (_branchia_). Caryo-: (in compounds) pertaining to the nucleus (_caryon_); hence:— Caryokineses: the movement of the nucleus. Caryolysis: dissolution of the nucleus. Caryoplasm: the matter of the nucleus. Centrolecithal: see under Lecith-. Chordaria and Chordonia: animals with a dorsal chord or back-bone. Cœlom or Cœloma: the body-cavity in the embryo; hence:— Cœlenterata: animals without a body-cavity. Cœlomaria: animals with a body-cavity. Cœlomation: formation of the body-cavity.