First Book of Zoölogy

abdomen adductor animals antennć aperture appearance appendages attached beetle bivalves body bones breathe air butterfly called canker-worm canker-worm moth caterpillar cephalo-thorax chrysalis clam claws collected common compound eyes crab crawfish crawling creature creeping disk crustaceans deposit edge eggs feelers fences flattened following figure represents foot fresh-water mussels fresh-water snails gills grass grasshopper hatch head highly magnified hind-leg hind-wings Incurrent Orifice insects jaws jointed legs labium land snails larva larvć Let the pupils ligament lines of growth lobster mandibles mantle maxillć 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 shown in Fig side siphon skin species specimens spiders spinnerets stages surface tentacles thorax thread three pairs true insects tube valves vertebral vertebral column wings worms