. Fig. 4. Amallocystisfagei Boschma on Euphausia frigida H. J. Hansen from St. 751. Longitudinal sections of host; a, approxi- mately in the median plane; b, slightly to one side. Letters as in Fig. i. In addition: /;/, heart of host; ov, ovary of host; r, roots. X 107. It is interesting that the specimen on Th. gregaria is the only one in which the organ of fixation possesses a prolongation of the kind described here. In the other specimens examined the organ of fixation terminates in a blunt, somewhat broadened extremity. Externally the parasites of the various species of Euphausiids are ver
. Fig. 4. Amallocystisfagei Boschma on Euphausia frigida H. J. Hansen from St. 751. Longitudinal sections of host; a, approxi- mately in the median plane; b, slightly to one side. Letters as in Fig. i. In addition: /;/, heart of host; ov, ovary of host; r, roots. X 107. It is interesting that the specimen on Th. gregaria is the only one in which the organ of fixation possesses a prolongation of the kind described here. In the other specimens examined the organ of fixation terminates in a blunt, somewhat broadened extremity. Externally the parasites of the various species of Euphausiids are very much alike. The larger specimens may show a much larger number of trophomeres and gonomeres than the smaller specimens, and in the latter the size of the trophomeres and gonomeres may be smaller than in the former, but these differences do not point to a specific distinction. Moreover, internally the examined specimens are almost entirely similar. As the organ of fixation of the specimen on Th. gregaria possesses a distinct spur directed posteriorly, causing a slightly different aspect of this organ as compared to
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