Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 TRACHEAL GILLS. 535 only applied externally to the viscera, but partially traverse them and serve at the same time to support them. Tracheal gills are present in the form of leaf-like or filiform appendages on the body of the larvae of Phryganidoe, EphemeridtB (tig. 444), and in the rectum of the larvae of jEschna and Libellula. FIG. 'tit.— a, Larva of E/rfemera with seven pairs of tracheal gills lit, slightly mngni
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 TRACHEAL GILLS. 535 only applied externally to the viscera, but partially traverse them and serve at the same time to support them. Tracheal gills are present in the form of leaf-like or filiform appendages on the body of the larvae of Phryganidoe, EphemeridtB (tig. 444), and in the rectum of the larvae of jEschna and Libellula. FIG. 'tit.— a, Larva of E/rfemera with seven pairs of tracheal gills lit, slightly mngnified. Tic, An isolated tracheal gill, strongly magnified, li, Tracheal system of an Ayrion larva (after L. Dufour); Tat, trachoal trunk ; Na, accessory eyes. 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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