. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ramiliecl folds (fip. 75). The parietal of the perfect as well as of the imperfect mesenteries (fig. 76) are in their ui>per part more or le.«s fan-hke, in their lower part elongated in a radial di- rection, the are here somewhat weaker on the side where the retractor is situated than on the (tig. 77). The ciliated tracts of the filaments are well developed on the perfect mesen- teries, the cnidoglandular tract is present also at least on several imperfect m
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ramiliecl folds (fip. 75). The parietal of the perfect as well as of the imperfect mesenteries (fig. 76) are in their ui>per part more or le.«s fan-hke, in their lower part elongated in a radial di- rection, the are here somewhat weaker on the side where the retractor is situated than on the (tig. 77). The ciliated tracts of the filaments are well developed on the perfect mesen- teries, the cnidoglandular tract is present also at least on several imperfect mesenteries which, however, had not ciliated Fig. 76. Andtc{ikia parvn. Transverse section of an imperfect mesentery at the level of the lower part of the actinopharynx. Fig. 77. Andtmkia ptinn. Transverse section of a directive mesentery ill its lower |)art. The perfect and some of the imperfect mesenteries are provided with acontia. No sectioned specimen was fertile, but owing to the smallness of the imperfect mesenteries it is not likely that they develop generative organs. The species propagates jirobably asexually, as there are so many irregularities in the arrangement of the mesenteries. The specimens occur often together on sliell- fragments or on small stones. The nematocysts of the acontia I Iiave examined in 4 speci- mens, their size showed good agreement. The microbasic amasti- gophors were 24-32, 27-31, 26-31 and 24-31//, the basitrichs 24-29, 26-29, 24-30 and 22-23//. Family Octineonidae. Abasilarin with nieaogloeal sphincter and acontia, the latter containins only I have (C' 1921 p. 132, 1931 p. 40) referred the following genus to the family .Andwakiidae, with which it has ninny characters in common, I suggested, that in Orlineon UnHnhli there were amastigophors as well as basitrichs in the acontia as I could at that time examine the acontia only in sections. As the following species had no in the
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
