. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 21 part 37 pairs (the mesenteries at the liinlms, however, nut examin- ed). On the one side of the two pairs of directives there were 4 perfect pairs, on the other side S^/j, all with strong; muscle pennons. Marking the perfect mesenteries with P, the other mesenteries provided with retractors with M, the weaker witli W and the weakest with w the arrangement of the mesenteries was as follows (dm: directive mesenteries). (iiii PP, WW, WW, WW, PP, inv, WM, wir, PP, irw, WW, irw, P
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 21 part 37 pairs (the mesenteries at the liinlms, however, nut examin- ed). On the one side of the two pairs of directives there were 4 perfect pairs, on the other side S^/j, all with strong; muscle pennons. Marking the perfect mesenteries with P, the other mesenteries provided with retractors with M, the weaker witli W and the weakest with w the arrangement of the mesenteries was as follows (dm: directive mesenteries). (iiii PP, WW, WW, WW, PP, inv, WM, wir, PP, irw, WW, irw, PP, dm WW, PP, WW, WW, WW, PP, WW, PM, WW, WW, ww, PP, ww, MM, WW, WM, WW, PP, WW, MM, ww, PP, ww, WW, Fig. 22. Sagartiogeton ingolfi. Section of a directive mesentery and of some other mesenteries in the lower part of the body. In tlie middle of the hoily all ww, ])t those marked with spaced-out figures, seem to be absent. Also the mesenteries iu one and the same pair are often not equally developed. Another individual had about 88 mesenteries at the limbus. The longitud- inal muscles of the mesenteries are, especially in the perfect mesenteries, very strong and form concentrated retractors showing in their distal part a characteristic appearance with a large fold directed outwards and separated from the main lamella of the mesenterv. In 21 and 22, I have figured mesenteries sectioned through the distal and pro.\imal parts of the body. The longitudinal muscles are weak inside and outside the retractors as also in the mesenteries marked with W and w. These latter mesenteries are fertile, seemingly devoid of filaments and reach only a short way into the coelenteron. The muscles are distinct, situated on a fold of the mesogloea in the proximal part of the body, in the middle they begin to disappear. Oral and aboral stomata are present. All stronger mesenteries, inclusive the directives, are fertile, in the sectioned specimen with ovaries. Se
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
