tag="{http://www.w3.org/1999/xhtml}a">205.—The beetles (Coleoptera), 206.—The ichneumon flies, ants, wasps, and bees (Hymenoptera), 212.

Class Myriapoda: The centipeds and millipeds.

Class Arachnida: The scorpions, spiders, mites, and tics.

XXII.—BRANCH MOLLUSCA: THE MOLLUSCS.

Example: The fresh-water mussel. (Unio sp.) [Laboratory exercise]. Structure, 239.—Life-history and habits, 243.

Other Molluscs.

Body form and structure, 245.—Development, 246.—Classification, 246.—Clams, scallops, and oysters (Pelecypoda), 246.—Snails, slugs, nudibranchs, and "sea-shells" (Gastropoda), 252.—Squids, cuttlefishes, and octopi (Cephalopoda), 255.

XXIII.—BRANCH CHORDATA: THE ASCIDIANS, VERTEBRATES, ETC.

Structure of the vertebrates, 259.—Classification of the Chordata, 260.—The ascidians, 261.

XXIV.—BRANCH CHORDATA (CONTINUED).

Class Pisces: The Fishes.

Example: The golden sunfish (Eupomotis gibbosus) [Laboratory exercise]. External structure, 263.—Internal structure, 265.—Life-history and habits, 270.

Other Fishes.

Body form and structure, 271.—Development and life-history, 276.—Classification, 277.—The lancelets (Leptocardii), 277.—The lampreys and hag-fishes (Cyclostomata), 278.—The true fishes (Pisces), 279.—The sharks, skates, etc. (Elasmobranchii), 279.—The bony fishes (Teleostomi), 281.—Habits and adaptations, 285.—Food-fishes and fish-hatcheries, 288.

XXV.—BRANCH CHORDATA (CONTINUED).

Class Batrachia: The Batrachians.

Body form and organization, 292.—Structure, 293.—Life-history and habits, 295.—Classification, 297.—Mud-puppies, salamanders, etc. (Urodela), 297.—Frogs and toads (Anura), 299.—Cœcilians (Gymnophiona), 302.

XXVI.—BRANCH CHORDATA (CONTINUED).

Class Reptilia: The snakes, lizards, turtles, crocodiles, etc.

Example: The garter snake (Thamnophis sp.) [Laboratory exercise]. Structure, 303.—Life-history and habits, 308.

Other Reptiles.

Body form and organization, 310.—Structure, public@vhost@g@gutenberg@html@files@41395@[email protected]#Page_311" class="pginternal"