. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 174 THE RESPIRATORY SYSTEM [CH. each divides into two branches. One of these turns inwards to supply the posterior part of the rectum, the anal region, and, in Zvgoptera, the median caudal gill. The other turns sharply outwards to receive a short branch from the junction of the VNT. VNT 9. 10. Fig. 76. Tracheal system of larva of Dendroaeschna conspersa Tillyard, exclusive of head ( x 6). oZj, aZg alar trunks; ht trachea to heart; P2, p^ pedal tracheae; 2)s branch to metastigma; B rectal efferents; TA thoracic anastomosis;

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. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 174 THE RESPIRATORY SYSTEM [CH. each divides into two branches. One of these turns inwards to supply the posterior part of the rectum, the anal region, and, in Zvgoptera, the median caudal gill. The other turns sharply outwards to receive a short branch from the junction of the VNT. VNT 9. 10. Fig. 76. Tracheal system of larva of Dendroaeschna conspersa Tillyard, exclusive of head ( x 6). oZj, aZg alar trunks; ht trachea to heart; P2, p^ pedal tracheae; 2)s branch to metastigma; B rectal efferents; TA thoracic anastomosis; Vc visceral crossing; Vr visceral remnant; 1-10 abdominal segments. Other references as in fig. 75. Original; from a dorsal 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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