First Book of Zoölogy

abdomen adductor animals antennæ aperture appearance appendages APPLETON attached beetle bird bivalves body bones BOTANY breathe air butterfly called canker-worm caterpillar cents cephalo-thorax chrysalis clam claws collected common compound eyes crab crawfish crawling creature creeping disk crustaceans deposit edge eggs examine eyes flattened following figure represents foot fresh-water mussels fresh-water snails gills grass grasshopper hatch head hind-leg insects Introduction price jaws jointed legs labium land snails larva larvæ Let the pupils ligament lines of growth lobster mandibles mantle maxillæ metatarsus moults mouth mouth-parts muscles mussel myriapods nests number of segments operculum oyster pairs of legs palpi palpus portion protruded pupa regions salamander salt-water seen separate shed shell showing side siphon skin species specimens spiders spinnerets spiracles stages surface tentacles thorax thread three pairs true insects tube valves vertebral vertebral column wings worms young