Lagoon': a pool or lake; the still water inclosed within an atoll.

Lar'va: 57.

Lepidopterous: referring to the Lepidoptera, or moths and butterflies. Lĭt'toral: 160.

Lu'men: the cavity of a tubular organ. 44.

Medu'sa: 24.
Měg'alops: 59.

Měs'oderm: 20.

Mětǎb'olism: the act or process by which dead food is built up into living matter, and living matter is broken down into simpler products within a cell or organism.

Mětamorphosis: 56.

Migration: 70.

Millimeter: about one twenty-fifth of an inch; a term used in the metric system of measure.

Mim'icry: 112.

Mind: 140.

Molt: 57.

Monŏg'amous: said of animals in which a male mates with only a single female.

Multiplication: used in the text usually synonymously with reproduction.

Myrmecoph'ilous: said of insects which are found inhabiting the nests

of ants.

Natural selection: 70.

Nō'tochord: an elastic rod, or row of cells, formed in the early embryo of chordate animals (including all the vertebrates and some others), which lies below the dorsal nervous tube and above the ventral alimentary tube.

Nu'cleus (pl. nuclei): 2.

Esophagus: 42.

Olfactory referring to the sense of smell.

Oma'sum: 42.

Organ: 37.

Organic: referring to the matter of which animals and plants are com

posed.

Organism: a living being, plant or animal.

Orienta'tion: 95.

O'tolith: 121.

Papil'la (pl. papillæ): a small nipple-like process, as the papillæ of the

skin or tongue.

Parasite: 93.

Parthenogĕn'esis: 35.

Pělǎg'ic: inhabiting the surface of mid-ocean. 160.

Pharynx: 42.

Physiology: 39.

Plǎt'yrrhine: broad-nosed; said of the New-World monkeys.

Plu'teus: 59.

Polyg'amous: said of animals in which a single male mates with sev

eral females: 35.

Polymorphism: 24.
Pŏl'yp: 21.

Post-embryonic: 49

Præcō'cial (pre-co'-shal): 79.

Prěd'atory: feeding on other animals.

Prō'polis: 84.

Protective resemblance: 107.

Protoplasm: 2.

Proventriculus: 42.

Pseudopod: 4.

Psychic: 140.

Pu'pa: 57.

Reason: 139.

Recognition mark: 77, 115.

Rěc'tum: 42.

Reflex action: 127.

Reproduction: 67.

Respiration: 4.

Reticulum: 42.

Rět'ina: 123.

Ru'men: 42.

Ru'minant: 42.

Salï'va: 42.

Sensation: 67.

Sensorium: 126.

Sĭl'ica: the mineral of which quartz, sand, flint, etc., are composed.

Spawn, v.: to lay eggs.

Specialization: 41.

Species: 151.

Sperm cell: 20.

Spir'acle: one of the breathing openings of an insect situated on the side of the abdomen or thorax.

Spon'gin: 20.

Stimulus (pl. stimuli): that which excites action in plant or animal tissue.

Stra'ta: layers, usually said of rocks.

Stridula tion: 122.

Sub-species: 151.

Symbiosi : 90.

Tactile referring to the sense of touch. 118.

Tadpole: 58.

Těn'tacle: a protruding flexible process or appendage, usually of the head of invertebrate animals, being used as an organ of touch, prehension, or motion.

Těrmitŏph'ilous: said of insects inhabiting the nests of termites.

Văc'uole: a minute cavity containing air, water, or a chemical secretion of the protoplasm, found in an organ, tissue, or cell.

Vestig'ial: 82.

Vis'cera: the organs in the great cavities of the body, commonly used for the organs in the abdominal cavity.

Yōlk (yōk): 48.

Zoe'a: 59.

Zōogeography: 147.

Zō'oid: one of the more or less independent members of a colonial or

compound organism.

Zōŏl'ogist: a student of animals.

INDEX

Actinocephalus oligacanthus (ill.), Animals, life of simplest, 1; many-

Amaba, 5; multiplication of (ill.) 53. | Aythya (illus.), 137.

Barrier, mountains a, to distribu- | Canal, alimentary, 66.
tion, 293; sea a, to distribution, Cankerworm-moth (illus.), 59.
288; temperature a, to distribu-
tion, 290.

Barriers affecting fresh-water ani-
mals, 294; effect of, 283; species
debarred by, 274; to distribu-
tion, character of, 288.
Basilarchia archippus mimicking
Anosia plexippus (illus.), 219.
Bassalian fauna, 305.
Beavers, nest of (illus.), 269.
Beetle, larva of (illus.), 146.
Beetles, lady-bird (illus.), 214.
Bird, egg of (illus.), 79.
Bird-louse (illus.), 188.
Bird of paradise (illus.), 58.

Birds, nest-making habits of, 264.
Birth, 78.

Care of young of mammals, 268.
Carpenter-bee, nest of (illus.), 160.
Caterpillar parasitized (illus.), 189,
(illus.), 190.

Cave blind-fish (illus.), 282.
Ceanothus (illus.), 141.
Cell, animal, 2; egg, 21, 56; plant,
2; products, 3; wall, 3.
Cells, brood, of honey-bee (illus.),
152; nerve, 240; reproductive,
29, 55.

Cellulose, 24, 27.

Centiped (illus.), 130.

Cerura, larva of (illus.), 216.
Chalk, 18.

Chick, embryonic stages of (illus.),

87.

Bittern, nestlings of (illus.), 246, Chitin, 91.

291; instincts of, 248.

Calcolynthus porimigenius (illus.), Clouded skipper butterfly, distri-

33.

Calf, taste buds of (illus.), 229.

Callorhinus alascanus (illus.),

136.

Camponotus (illus.), 155.

bution of (illus.), 273.

bution of (illus.), 273.
Coccidium oviforme (illus.), 14.
Cockroach, alimentary canal of
(illus.), 73; egg case of (illus.),
140.

Canadian skipper butterfly, distri- Cocoon of Cecropia moth (illus.),

141.