. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. II. II. I'ig. 14. Sarsia lubulosa. I'oiir diffcrpnt sta- tes of contraction of the stomach. Speci- mens from one single locality at the west coast of (ireenland, "Tjalfe" stat. 5iy. Though, accordingly, the ground-plane of the structure of the epithelium is about the same as that in the "brown" Sarsia, nevertheless the shape of the cells brings about another general picture of the epithelium. Probalily tliis difference of structure stands in correlation to th
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. II. II. I'ig. 14. Sarsia lubulosa. I'oiir diffcrpnt sta- tes of contraction of the stomach. Speci- mens from one single locality at the west coast of (ireenland, "Tjalfe" stat. 5iy. Though, accordingly, the ground-plane of the structure of the epithelium is about the same as that in the "brown" Sarsia, nevertheless the shape of the cells brings about another general picture of the epithelium. Probalily tliis difference of structure stands in correlation to the greater ]K)\ver of extension of the nianu- Ijriuni in tlie "scarlet" and (especial!}') in the "blue" Saisici in contradistinction to the "brown" form. This characteristic is not, however, a good means of practical distinction between the forms in (luestion, because it is somewhat circumstantial to cut sections in order to identify the animals, and the state of preservation of the specimens is also to be taken into consideration. In a samjjle, in which the well jireserved specimens may be referred to the t},'pe of the "brown" Sarsia, the l)adly i)reserved specimens may sliow a structure jiighly resembling that which I have described as characteristic for the two other forms. This distorted picture is ])ro])ab]y due to shrinkage and a connnencing dissolution of the cells. On the other hand, shrinkage and dissolution cannot be responsible for the picture found in the Danish specimens of the "liluc" and the "scarlet" Sarsia, l)ccause the specimens examined were very carefully preserved. The "scarlet" Scirsia exhibits still another structure, to which we may probably apply some significance: sections demonstrate that the densely pigmented apical chamber (textfig. 13) is nearly filled up with a solid mass of cndoderm, whereas the apical ehamlier in tiie "ftrown" and the "Ijlue" Sarsia contains
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
