. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Textfig. 62. Edwardsia vegae. I/jn^ituciinal section of the involved physa and of part of the scapus (sc), en: endoderm, ec: ectoderm, a: annular wall. ^â ?SV<Rv productive tract folds trianguloid. Expansion of the parietal muscles on the column? Colour in presen-ed state: Scapus dirty-brown. Dimensions in strongly contracted state with the physa and one part of the sca- pus involved: Length cm, largest breadth about cm. Occurrence: Arctic Sea of Siberia. Off Pittlekaj North of the winter harbour of the Vega 9â10
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. Textfig. 62. Edwardsia vegae. I/jn^ituciinal section of the involved physa and of part of the scapus (sc), en: endoderm, ec: ectoderm, a: annular wall. ^â ?SV<Rv productive tract folds trianguloid. Expansion of the parietal muscles on the column? Colour in presen-ed state: Scapus dirty-brown. Dimensions in strongly contracted state with the physa and one part of the sca- pus involved: Length cm, largest breadth about cm. Occurrence: Arctic Sea of Siberia. Off Pittlekaj North of the winter harbour of the Vega 9â10 fms. stones (Vega-Exp. 1879, No. 1002) I sp. Exterior aspect: The phj'sa is well- developed, but involved. It is perforated by a central aperture, surrounded by a ring of pro- bably 8 apertures. The scapus is provided with 8 distinct, longitudinal furrows and is thus polygonal. The nemathybomes are large, especially in the lower part, scattered over the whole surface and distinctly discernible to the naked eye. The capitulum being damaged, I cannot decide whether it is polygonal. The short tentacles are 16 in number. The actinopharynx is short. As it was not well-preserved I cannot say whether a siphonoglyphe is present or not. Anatomical description: The ectoderm of the physa is very high, considerably thicker than its mesogloea and provided with sparse nematocysts, 14â19 // long. On transverse-sections through the centre of the phj'sa a central aperture is seen which is probably formed by an involution of the ectoderm (textfig. 62). From the aperture an annular wall {a), probably of ectoderm, extends into the coelenteric cavity. (Com- pare Edwardsia vitrea). By the side of the central aperture I have on certain sections observed apertures of similar appearance. Accordingly there is probably a central aperture, surrounded by a ring of 8 apertures. On the inner side of the apertures a distinct layer of circular muscles is developed as in Halcampa. The scapus-ectoderm is thin
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscienti, bookyear1921
