. Elementary entomology . Fig. 2. Diagram to express the fundamental structure of an arthropod (7, antenna ; a/, alimentary canal; b, brain ; d, dorsal vessel; ex, exoskeleton ; /, limb ; «, ner\-e chain ; .f, subesophageal ganglion. (After Schmeil, from Folsom) higher animals, such as the fishes, reptiles, birds, and mammals ; while in the latter are included all the lower forms of life, which are usually smaller in size and soft-bodied, as the molluscs, echino- derms, worms, insects, and their relatives. 5

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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912