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.

Polygamous: said of animals in which a single male mates with sev

eral females: 35.

Polymorphism : 24.
Pol'yp: 21.

Post-embryonic: 49

Præcō'cial (pre-co'-shal): 79.

Prěd'atory feeding on other animals.

Propolis: 84.

Protective resemblance: 107.

Prō toplasm: 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.

Sali'va: 42.

Sensation: 67.

Sensorium: 126.

Silica: 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.

Symbiosis: 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.

Vǎc'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.

Zoē'a: 59.

Zōogeography: 147.

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

compound organism.

Zōŏlogist: a student of animals.

INDEX

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

Albula vulpes, metamorphosis of Antrostomus vociferus (illus.), 203.

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

Barrier, mountains a, to distribu- | Canal, alimentary, 66.
tion, 293; sea a, to distribution,
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.

Cankerworm-moth (illus.), 59.
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.

33.

291; instincts of, 248.

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

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.

Colon, 68.

Dead-leaf butterfly (illus.), 211.

Colonial jelly-fishes, 45; Protozoa, Death, 103.

24.

Colony, 31.

Color, 222.

Coloration, alluring, 216.
Colors, warning, 212.
Commensalism, 172, 173.
Communal life, 168; advantages
of, 170.

Communities, animal, 149.
Conditions, primary, of animal
life, 106.

Conjugating cells, 28.
Conjugation, 11, 27, 55.
Contractile vacuole, 10.

Coral, brain, 45; island (illus.),
44; organ-pipe (illus.), 45; red,

45.

Corals, 37-43.

Corynolophus reinhardti (illus.),
124.

Deep-sea angler (illus.), 124.
Deer, horns of (illus.), 148.

Defense of the young, 137.
Degeneration, causes of, 197, 198;
human, 200; through quiescence,
193.
Desiccation, 104.

Development, 78; continuity of,
83; divergence of, 84; embry-
onic, 80; first stages in (illus.),
81; laws of, 86; metamorphic,
90; of flounder (illus.), 100; of
locust (illus.), 91; of vertebrates,
(illus.), 87; post-embryonic, 80;
significance of facts of, 89.
Diapheromera femorata (illus.),

209.
Differentiation, 41; of structure,

64.
Dimorphism, 42; sex, 58.

Cottony cushion scale (illus.), 142. Diodon hystrix (illus.), 134.
Courtship, instincts of, 248.
Crab, metamorphosis of (illus.), 97;

with sea-anemone (illus.), 177.
Cray-fish, auditory organ of (illus.),
233.

Cricket, auditory organ of (illus.),
234.

Cricket, mole (illus.), 146.

Crinoid (illus.), 305.

Crop, 71.

Crowd of animals, 114.

Crustaceans, adults and larvæ

(illus.), 195.

Dismal Swamp fish (illus.), 282.
Distribution, character of barriers,
to, 288; geographical, 272; in-
fluenced by climate, 291; laws
of, 274; modes of, 296; moun-
tains a barrier to, 293; of Cana-
dian Skipper butterfly (illus.),
273; of clouded Skipper butter-
fly (illus.), 273; of Erynnis mani-
toba (illus.), 273; sea a barrier
to, 288; temperature a barrier
to, 290.
Diverticula, 74.

Cteniza californica, nest of (illus.), | Division of labor, 22, 168.

261.

Cyanocitta cristata (illus.), 138.

Cycle, life, 78.

Cypselurus (illus.), 131.

Cytoplasm, 3.

Dog, pointer (illus.), 256.
Dragon-fly, eye of (illus.), 239.
Duck, family (illus.), 137.
Duodenum, 68.

Duration of life, 101.