. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Fig- 50- Fig- 51- ping, differently located according to the different state of concentration of the physa. In the Wij de-specimen the waU turned towards the ectoderm, (textfigs. 50, 51), while in E. vegae (compare this species) it turned in- wards. The wall is almost exclusively composed of elongated cells with large nuclei. The nemathybomes of the examined type-specimen are flat and, on account of the bad preservation, containing only a few whole nematocysts, the greater part of which are shrivelled, and as the stinging th
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Fig- 50- Fig- 51- ping, differently located according to the different state of concentration of the physa. In the Wij de-specimen the waU turned towards the ectoderm, (textfigs. 50, 51), while in E. vegae (compare this species) it turned in- wards. The wall is almost exclusively composed of elongated cells with large nuclei. The nemathybomes of the examined type-specimen are flat and, on account of the bad preservation, containing only a few whole nematocysts, the greater part of which are shrivelled, and as the stinging thread is thrown out there is no distinct limit between the capsule and the thread. The nematocysts in the nemathybomes of the other spec- imens were numerous, excepting the badly preserved Wij de-specimen where I found only a few nematocysts. In the following table I have set up the size of the nematocysts in the different tracts of the animal. It ought to be mentioned that the nematocysts are measured only in sections of the type-specimen. The measures are therefore a little uncertain. Habitat scapus capitulum tentacles actinopharynx Great fiord 68°2i'N (typesp.) East-Greenland . . Wijde bay 36—38 X ,u about 38 37—42 X 3—3-5 34—38 X 3 14 17 X 2 U 14 17 X 2 10 12 24—29 X — U 17—29 X — 19—25 38—51 X ^( 36—53 X 3 36—48 X 3-5 31—36 X 3 17- 20- -22 -24 X In the specimen from Wijde bay I found only 2 nematocysts in the maceration preparation of the nemathybomes, and in the specimen from Great Islet none, (as the parietal muscles of the latter are very strong it is, however, probable that we have to do with E. vitrea). The periderm of the scapus is very thin and only a little incrusted. The nematocysts of the capitular ectoderm are rather numerous, in the tentacles very numerous. The spirocysts of the tentacles obtain a size. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscienti, bookyear1921
