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Economic Zoology: An Introductory Text-Book in Zoology, with Special ...
No preview available - 2013
abdomen adapted adult alimentary canal alimentary tract Amphioxus anal opening animals aperture appendages aquatic artery attached birds blood body branchial burrows carapace cavity cells cephalothorax character colony common compound eyes connected considerable number destructive Diagram distinct distribution division domestic dorsal duct Echinoderms ectoderm eggs elongated endoderm esophagus extended external eyes feed female fishes forms ganglia gastrula gills glands habit hatch head host immense numbers inches includes individuals insects intestine large number larva layers legs located male mammals maxilla ment minute mollusks muscle nephridia nervous system nests notochord occur Order organs ovary oviduct pair parasitic Parker and Haswell pharynx plates portion posterior premaxilla primitive Protozoa pupa region reproductive respiration segments sheep shell side slender specialized species spiracles stage stomach structure surface tail tapeworm tentacles thorax tion tissues U. S. Dep usually vein ventral ventricle vertebral column vertebrates vessels wings worm