First Book of Zoölogy

551 Broadway abdomen adductor animals antennæ aperture appearance appendages APPLETON attached beetle bivalves body bones breathe air butterfly called canker-worm caterpillar 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 jaws jointed legs labium land snails larva larvæ lessons Let the pupils ligament lines of growth lobster magnified 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 shown in Fig side siphon skin species specimens spiders spinnerets stages studied surface tentacles thorax thread three pairs true insects tube valves vertebral vertebral column wings worms young