. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. l^tOrfLi.*^ Fig. 79. Portions of the freshly opened gill-basket, to shew form of gills, a. Parts of three holobranchs from Austrogomphus ochraceus Selys (undulate simplex). B. The same from Austroaeschna multipuaetata Martin (implicate), c. The same from anterior portion of basket of Atschna brevistyla Ramb. (normal foliate). D. The same from Anax papuensis Burm. (papillo-foliate). e. The same from Synthemii macrostigma Selys (archi-lameUate). f. Anterior halves of three liolobranchs from Diplacodes haematodes Burm. (neo-l
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. l^tOrfLi.*^ Fig. 79. Portions of the freshly opened gill-basket, to shew form of gills, a. Parts of three holobranchs from Austrogomphus ochraceus Selys (undulate simplex). B. The same from Austroaeschna multipuaetata Martin (implicate), c. The same from anterior portion of basket of Atschna brevistyla Ramb. (normal foliate). D. The same from Anax papuensis Burm. (papillo-foliate). e. The same from Synthemii macrostigma Selys (archi-lameUate). f. Anterior halves of three liolobranchs from Diplacodes haematodes Burm. (neo-lamellate). Original. The Duplex System (figs. 78 b, c; 79 b-f; 80, 4~ii). In this system, the main-folds may be present, but not func- tioning as gills (Aeschninae), or entirely absent {Libellididae). The gills are formed entirely from the double series of cross-folds, which become enlarged to form twelve series, or hemibranchs, of separate obliquely-placed or transverse gills, arranged in six double series, or holobranchs. As will be seen from fig. 78, each holobranch. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tillyard, Robin John, 1881-1937. Cambridge [Eng. ] : University Press
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