GLOSSARY

[Only those terms are defined in this glossary that are not explained in the text. In the case of the terms defined or explained in the text, reference is made to the number of the paragraph in which the explanation occurs. The pronunciation of the vernacular and scientific names of the animals mentioned in the text is given in the Classification.]

Aboma'sum: 42.

Adaptation: 67, 74.

Albuminous: said of substances containing albumen.

Alimentary canal: 42.

Alluring coloration: 111.

Altric'ial: 79.

Altruistic instinct: 129.

Amoeboid: having the changing form of an Amoœba.

Anǎd'romous: said of fishes that go from the sea up rivers to lay their

eggs.

Anǎt'omy: 39.

Animǎl'cule: an animal of microscopic smallness.

Antěn'næ: the " feelers," the most anterior pair of appendages of insects and insect-like animals; situated on the head, and the seat of organs of special sense.

An'thropoid: man-like.
A'nus: 42.

Appěn'dix vermifor mis: 82.

Artificial selection: 72.

Assimilate to receive food and transform it into a homogenous part

of the body substance.

Atŏll': a ring-shaped coral island nearly or quite inclosing a lagoon. Atrophy: a stoppage of the growth or development of a part or organ. Auditory referring to the sense of hearing.

Automatism: the state of being automatic; involuntary action.

Bassa lian: 160.

Biologist: student of animals and plants.

Blǎs tōderm: 50.

Blǎs'tula: 50.

Budding: the process of reproduction among animals in which a small part of the body substance of an animal grows out from the surface, separates from the parent, and develops into a new individual.

Cæ'cum (se-kum): 42.

Carnivorous: flesh-eating.

Căt'arrhine: nostril downward; said of the narrow-nosed Old-World monkeys.

Cell: 2.

Cellulose: a peculiar compound insoluble in all ordinary solvents, forming the fundamental material of the structure of plants, and also contained in the mantle of tunicates.

Chitin: 57.

Chlorophyll: 13.

Chromatophore: a color-bearing granule or sac.

Chromosome: 2.

Chrysalis: 57.

Chyle: 42.

Cilia: 5.

Cleavage: 50.

Cō lon: 42.

Commĕn'salism: 90.

Com'munal: 83.

Conjuga tion: 5.

Contractile vacuole: a vacuole that dilates and contracts regularly, and is supposed to have an excretory function.

Cyst: 98.

Cytoplasm: 2.

Degeneration: 95.

Development: 46.

Differentiation: the setting apart of special organs for special work; progressive change from general to special; specialization.

Digestion: the process of dissolving and chemically changing food so that it can be assimilated by the blood and furnish nutriment to the body.

Dimorphism: 24.

Diverticulum: a blind pouch arising from another larger pouch. 44. Duodē num: 42.

Ec'tōblast: 50.

Ec'tōderm: 20.

Egg-cell: 20.

Egois'tic instinct: 129.

Embryology: 39.

EmbryŎn'ic: 49.

En'dōblast: 50.

En'dōderm: 20.

Environment: an organism's surroundings taken collectively. Ex'cretory: referring to excretion, as excretory organs, the organs which get rid of waste matter in the animal body.

Fau'na (fawna): 157.

Fertilized egg: 20.

Fis'sion: 4.

Flagěl'la: 13.

Function: 37.

Găn'glion (pl. ganglia): a nerve-center composed of an aggregation of

nerve-cells.

Gǎs'trula: 50.

Gěm'mule: 20.

Generalization: 41.

Geologist: student of the structure and history of the earth.
Grēgā rious: 87.

Growth: 46.

Habit: 139.

Herbivorous plant-eating.

Herěd'ity: 54.

Hermaphrodit'ic: 35.

Hiberna tion: passing the winter in a death-like sleep.

Hōmogeneous: of the same composition or structure throughout.

I'leum: 42.

Inorganic: not being nor having been a living organism; not organic. Insectivorous: insect-eating.

Instinct: 128.

Intellect: 139.

Intercěl'lular: outside of and between the cells.

Jeju'num: 42.

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

Lar'va: 57.

Lepidopterous: referring to the Lepidoptera, or moths and butterflies.
Littoral: 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.

Monogamous: said of animals in which a male mates with only a single female.

Multiplication: used in the text usually synonymously with repro

duction.

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

Natural selection: 70.

No 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.

soph'agus: 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.

Orientation: 95.

O'tolith: 121.