. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Textfig. 80—82. Mitne-Edwardsia polaris. Fig. 80: Transverse section of a parietal muscle in the upper part of the glan dular tract. Fig. 81: Transverse section of a pennon in the same tract. Fig. 82 Section of scapus -with groups of nematocysts (n). state of contraction of the different parts. The tentacles are not more than 12, on one specimen I observed tliat the two tentacles projecting from the ventro-lateral compartmetits are smaller than the others. The oral disc is inconsiderable, the actinopharynx is short and furni
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Textfig. 80—82. Mitne-Edwardsia polaris. Fig. 80: Transverse section of a parietal muscle in the upper part of the glan dular tract. Fig. 81: Transverse section of a pennon in the same tract. Fig. 82 Section of scapus -with groups of nematocysts (n). state of contraction of the different parts. The tentacles are not more than 12, on one specimen I observed tliat the two tentacles projecting from the ventro-lateral compartmetits are smaller than the others. The oral disc is inconsiderable, the actinopharynx is short and furnished with 8 longitudinal ridges at the in- sertions of the mesenteries; between the ridges there are deep longitudinal furrows. An indication of a ventral siphonoglyphe seems to be found (the specimens were, howe\-er, not so well preserved that I can state this with certainty). Anatomical description: The ectoderm of the scapus is now thin, now more thick, especially in the parts containing nematocysts. The cuticle is weak, especially in comparison with that of M. loveni and carnea. The nematocysts which in the scapus-ectoderm reach a size of (14) 17—22 X 2, 5—3 (3,5) n are here a little numerous and packed together in groups, scattered between the insertions of the mesen- teries and, on account of the thickening of the ectoderm, sometimes sunk a little down in the mesogloea (textfig. 82). The mesogloea is of about the same thickness as the ectoderm, the endoderm is however thin- ner. The high ectoderm of the capitulum contains nematocysts, 14—17 fi long, arranged on the ridges. In the parts of the involved cai)itulum which are the most closely pressed together the mesogloea forms high ridges. 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 Ingolf (Cruiser); Danish Ingolf-Expedition (1895-1896). Cope
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscienti, bookyear1921
