. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 578 Dr. D. Keiliii on the Each egg is surrounded by a gelatinous layer, and they are all embedded in a coranion gelatinous mass, somewhat similar to that of various Chironoraids or Rhyphids (^Rhyphus and. Mycetobia). The egg is of a very dark brown colour and of a peculiar shape, which to my knowledge has not yet been encountered in any other insect. It is of elongate oval shape, 500 yu. lono- and 75 yu. in diameter, and sharply bent in its middle so that its two branches come
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 578 Dr. D. Keiliii on the Each egg is surrounded by a gelatinous layer, and they are all embedded in a coranion gelatinous mass, somewhat similar to that of various Chironoraids or Rhyphids (^Rhyphus and. Mycetobia). The egg is of a very dark brown colour and of a peculiar shape, which to my knowledge has not yet been encountered in any other insect. It is of elongate oval shape, 500 yu. lono- and 75 yu. in diameter, and sharply bent in its middle so that its two branches come almost into contact. The embryo and the young larva have the same curvature as the egg. When the larva hatches, the egg is split at one end, corresponding to the anterior and dorsal side of the enclosed larva, and the two edges of the split roll up externally, leaving a triangular opening through which the larva escapes. Text-fis. A small portion of an egg-mass of Dasj/helca obscura, showing the eggs (a) before aud (b) after the hatching of the larvae; the gelatinous mass covering- the egg^s is not represented in the figure. III. LiRVA. The larva when it hatches from the egg is 0'7 mm. long; it grows, undergoing several moults, and when ready to pupate it reaches 4 to 5 mm. in length and 0*2 to 0'3 mm. in diameter. The movements of the larva are very slow; it does not swim, and, when immersed in water, it crawls very slowly on the bottom of the dish, bending and unbending its body. The latter is composed of a head, 3 thoracic and 8 abdominal segments, the last abdominal segment being double (PI. XIX. fig. 8).. 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 London, Taylor and Francis, Ltd
Size: 1489px × 1678px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
