. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. vn 10 Pig. 92. Internal reproductive organs of Aeschna hrevistyla Ramb., (J, dorsal view ( X 2). sr sperm-reservoir; ts testis; vd vas deferens; vn ventral nerve-cord; 4-10 abdominal seg- ments. Original, from a Fig. 93. through portion of testis of a freshly-emerged male of Isch- nura aurora Br,, to shew lobules; «! spermatidia; s^ immature sper- matozoa; Sg ripe spermatozoa ( x 150). Original. Agrion and Calopteryx. Fig. 94 shews a mature spermatozoon of the latter genus. The head {h) is very short, 0&q
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. vn 10 Pig. 92. Internal reproductive organs of Aeschna hrevistyla Ramb., (J, dorsal view ( X 2). sr sperm-reservoir; ts testis; vd vas deferens; vn ventral nerve-cord; 4-10 abdominal seg- ments. Original, from a Fig. 93. through portion of testis of a freshly-emerged male of Isch- nura aurora Br,, to shew lobules; «! spermatidia; s^ immature sper- matozoa; Sg ripe spermatozoa ( x 150). Original. Agrion and Calopteryx. Fig. 94 shews a mature spermatozoon of the latter genus. The head {h) is very short, 0"01 mm., cylindrical, with elongated nucleus (>m). The middle piece (m) is five times as long as the head, and almost as wide. The tail {t) is of great length, nearly 0*2 mm., excessively thin, and undergoes violent lashings by means of which the organism is propelled. 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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