Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 FIG. 441.—a, Larva of Ephemera vrith seven pairs of ti-acheal Kills Kt, slightly Tk, An isolated tracheal gill, strongly magnified. I, Tracheal system of an Agrimi Inrva (after L. Dufour); Tst, tracheal trunk ; Nn, accessory ejTes. In the last case the walls of the rectum are very muscular, and are capable of regularly pumping in and out water, thus giving rise to a kind of respiratory movement.

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