General Zoölogy: Practical, Systematic and Comparative; Being a Revision and Rearrangement of Orton's Comparative Zoölogy

abdomen Alcyonaria alimentary canal antennæ artery auricle birds blood vessels bones brain Branch calcareous called capillaries carnivorous cells cephalothorax cerebellum cilia CLASS color consists coral cord corpuscles covered crab crocodile crustaceans cuttlefish developed digestive DODGE'S GEN dorsal eggs embryo epidermis esophagus eyes fibers fins fishes fluid forms frog ganglia gills glands gullet head heart higher animals hind horny hydra insects intestine invertebrates jaws labium larvæ layer legs limbs liver living lobes lobster locomotion lower lungs magnified mammals mandibles mantle maxillæ membrane Metazoa microscopic mollusks mouth muscles muscular nerve nervous system notochord opening Order organs pair plants polyps protoplasm Protozoa quadrupeds reptiles resembling respiration sea urchin segments shell side skeleton skin skull snail species spiders spinal spines sponge starfish stomach structure substance surface tail teeth tentacles thorax tion tissue toes tongue tube upper usually valves ventricle vertebral column vertebrates whale wings worms Zoantharia