Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 TEACH 71 cf the body (fig. 6G a, h) {stigmata of Insects, Spiders), or they may be more restricted in number, and communicate also with cavities of complicated structure which are used for other functions (nasal cavities of Yertebrates). In the aquatic larvaj of certain fro. -jf an Ephemeral fly with seven pairs-of tracheal cri'is Lf, Hlightly magnified ; Tk, isolated tracheal gill strongly magnified. Fig. 676.—Trach
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 TEACH 71 cf the body (fig. 6G a, h) {stigmata of Insects, Spiders), or they may be more restricted in number, and communicate also with cavities of complicated structure which are used for other functions (nasal cavities of Yertebrates). In the aquatic larvaj of certain fro. -jf an Ephemeral fly with seven pairs-of tracheal cri'is Lf, Hlightly magnified ; Tk, isolated tracheal gill strongly magnified. Fig. 676.—Tracheal sys- tem at the sides of the alimentary canal of an Agrion larva (after L. Dufour). T»/, main tracheal trunk ; Kt, tracheal gills; Na, the three simple eyes. Insects (Ephemeridae, Libellulidse) the tracheae may be without any external openings. In such cases processes of the body filled with a close network of tracheae, which take up oxygen from the water, and are known as tracheal gills, are developed (fig. 67 a, h). In rare instances tracheal gills are developed on the wall of the rectum, and
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