. Fig. 3. Amallocystis fagei Boschma on Euphausia frigida H. J. Hansen. Transverse sections of hosts, a, specimen from St. 766; b, specimen from St. 665. Letters as in Fig. i. In addition: ", gonomere. x 70. A more enlarged photograph of part of a section next to the one of the upper figure is given in the lower figure of PI. XL. It shows the lower part of the organ of fixation with the sieve plate and the protoplasmatic excrescences protruding through this plate. The figure shows further that the cuticle of the organ of fixation is rather thick, and that in some parts, especially in the
. Fig. 3. Amallocystis fagei Boschma on Euphausia frigida H. J. Hansen. Transverse sections of hosts, a, specimen from St. 766; b, specimen from St. 665. Letters as in Fig. i. In addition: ", gonomere. x 70. A more enlarged photograph of part of a section next to the one of the upper figure is given in the lower figure of PI. XL. It shows the lower part of the organ of fixation with the sieve plate and the protoplasmatic excrescences protruding through this plate. The figure shows further that the cuticle of the organ of fixation is rather thick, and that in some parts, especially in the right side of the figure, it is strongly wrinkled. On the proximal parts of the protoplasmatic excrescences also a cuticle has developed, though it is much thinner than that of the organ of fixation. (7) Specimen on E. frigida from St. 751 (Fig. 4). The host was sectioned longitudinally. One of the sections (a) shows a median section of the parasite. Its organ of fixation does not present a pronounced constriction between the internal and external parts. The external part broadens into the common basal part of the trophomeres. The sieve plate is found in the lower part of the organ of fixation, pointing to the posterior region of the host. Through this plate protoplasmatic excrescences are seen to extend into the ovary of the host, where they divide into a well-developed root system. In this specimen the root system is pronouncedly different from other spaces in the ovary, so that the exact number of roots occurring in the sections could be drawn. At its sides the parasite is surrounded by irregular masses of chitin. The other drawing (b) is after a section not far from the first one. It shows that the roots penetrate for a rather long distance towards the posterior region of the ovary of the host. (8) Specimen on Thysanoessa gregaria from St. 871 (Fig. 5). Five sections are drawn, each section being at a distance of 20/^ from the next. In the section of the most anterior part
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
