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PART II

SYSTEMATIC ZOOLOGY

XIV.—THE CLASSIFICATION OF ANIMALS.

[Laboratory exercise and recitation], 65.—Basis and significance of classification, 65.—Importance of development in determining classification, 67.—Scientific names, 68.—An example of classification, 68.—Species, 69.—Genus, 70.—Family, 72.—Order, 72.—Class and branch, 73.

XV.—BRANCH PROTOZOA: THE ONE-CELLED ANIMALS.

Example: The bell animalcule (Vorticella sp.) [Laboratory exercise], 75.

Other Protozoa.

Form of body, 78.—Marine Protozoa, 80.

XVI.—BRANCH PORIFERA: THE SPONGES.

Example: The Fresh-water sponge (Spongilla sp.) [Laboratory exercise], 84.

Example: A calcareous ocean-sponge (Grantia sp.) [Laboratory exercise], 85.

Example: A commercial sponge [Laboratory exercise], 86.

Other Sponges.

Form and size, 87.—Skeleton, 88.—Structure of body, 88.—Feeding habits, 88.—Development and life-history, 89.—The sponges of commerce, 90.—Classification, 91.

XVII.—BRANCH CŒLENTERATA: THE POLYPS, SEA-ANEMONES, CORALS, AND JELLYFISHES.

Polyps, sea-anemones, corals, and jellyfishes.

General form and organization of body, 93.—Structure, 94.—Skeleton, 95.—Development and life-history, 95.—Classification, 96.—The polyps, colonial jellyfishes, etc. (Hydrozoa), 97.—The large jellyfishes, etc. (Scyphozoa), 101.—The sea-anemones and corals (Actinozoa), 102.—The Ctenophora, 107.

XVIII.—BRANCH ECHINODERMATA: THE STARFISHES, SEA-URCHINS, SEA CUCUMBERS, ETC.

Example: Starfish (Asterias sp.) [Laboratory exercise].—External structure, 108.—Internal structure, 110.—Life-history and habits, 113.

Example: Sea-urchin (Strongylocentrus sp.) [Laboratory exercise].—External structure, 113.

Other Starfishes, Sea-urchins, Sea cucumbers, etc.

Shape and organization of body, 116.—Structure and organs, public@vhost@g@gutenberg@html@files@41395@[email protected]#Page_117" class="pginternal"