. Annales de biologie lacustre. Natural history; Freshwater animals; Freshwater plants; Lakes. Fig. 1. — Jlnagrus ? subfuscus FORST. A. Egg. — B. 1 st. larval stage, newly hatched. — C. The same, head end separated. D. E. Histriobdellid larval stage. — F. Mature larva. — (Copies from GANIN.) If we observe through the translucent egg-shell an Ery- , having this stage within itself, the parasite is seen te be very turbulent, it turns and bends in différent direc- tions, so that ail the contents of the egg will be incessantly circulating around it. It moves its mouth-hooklets, and, in
. Annales de biologie lacustre. Natural history; Freshwater animals; Freshwater plants; Lakes. Fig. 1. — Jlnagrus ? subfuscus FORST. A. Egg. — B. 1 st. larval stage, newly hatched. — C. The same, head end separated. D. E. Histriobdellid larval stage. — F. Mature larva. — (Copies from GANIN.) If we observe through the translucent egg-shell an Ery- , having this stage within itself, the parasite is seen te be very turbulent, it turns and bends in différent direc- tions, so that ail the contents of the egg will be incessantly circulating around it. It moves its mouth-hooklets, and, in contradistinction to the larva of GaNIN the antennae of which are described as immovable, the antennae of Brocheri can be moved and shortened, and even quite retracted. The gut fills most of the body (its limits are indicated in fig. 2 B) and opens in the posterior end of the body. In larvae having reacheJ a size of 0,51 mm (fig. 2 C), I never found any other appenda?es. 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 Station biologique d'Overmeire. Bruxelles : F. Vanbuggenhoudt
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnatural, bookyear1922
