. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Fig. 204 Fig. 205 Textfigs. 204—205. Sicyonis variabilis. Fig. 204: Longitudinal section of the apex of tentacles. Fig. 205: Transverse section of the base of a mesentery with basilar muscles. The arrangement of the mesenteries recalls that of S. ingolfi and tuherculata but is more irregular. In order to ascertain it, I have examined one whole spec- imen and half two specimens. The textfigure 206 .-1, B shows the arrangement of the mesenteries, each in one half of two specimens, the textfigure 207 that of the third specimen.
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Fig. 204 Fig. 205 Textfigs. 204—205. Sicyonis variabilis. Fig. 204: Longitudinal section of the apex of tentacles. Fig. 205: Transverse section of the base of a mesentery with basilar muscles. The arrangement of the mesenteries recalls that of S. ingolfi and tuherculata but is more irregular. In order to ascertain it, I have examined one whole spec- imen and half two specimens. The textfigure 206 .-1, B shows the arrangement of the mesenteries, each in one half of two specimens, the textfigure 207 that of the third specimen. In A and B all mesenteries have been drawn, in textfigure 207 the fertile have been left out. In the textfigure 206 ^4 the most weakly drawn mesenteries are not provided with longitudinal pennons and re- productive organs, but are certainly future, fertile me- senteries, though the reproductive organs have not yet been developed, owing to the small size of the spec- imen (the height i cm, breadth 2,2 X 1,5 cm). These mesenteries appear only in the most proximal part of the body. I think that I have also in this species been able to determine the mesenteries of the first cycle (I). If we examine the textfigures more narrowly, we find that there are in A (in one half of the specimen) 26 stronger pairs of mesenteries, of which 7 pairs perfect and 2 pairs consisting of one imperfect and one perfect mesentery, in B 23 sterile mesenteries, of which 11 pairs perfect and 4 pairs built up of imperfect and one perfect mesentery (on the other, not drawn half 10 pairs were perfect and 2 pairs made up of one imperfect and one perfect mesentery). In C (fig. 207) we see on one side 21 pairs of sterile mesenteries, of which 9 perfect and 4 made up of one imperfect and one perfect mesentery, on the other side 24 pair, of which 8 perfect and 5 pairs consisting of one perfect and one imperfect mesentery. The arrangement of the mesenteries thus displays great differences, and the mesenteries ar
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscienti, bookyear1921
