. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. I V. I must admit, however, that having examined a considerable material from other geographical regions, I cannot api)ly a decisive importance to these differences; in any case, the\- do not suffice as a means of a specific separation of the forms in (juestion. â I shall commence with a description of the endoderm of the "brown" Sarsia (see the textfigs. 6 and 9). The endodermal epi- thelium of the manubrium is a columnar epithelium, consisting of long, narrow cells, visibly rea
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. I V. I must admit, however, that having examined a considerable material from other geographical regions, I cannot api)ly a decisive importance to these differences; in any case, the\- do not suffice as a means of a specific separation of the forms in (juestion. â I shall commence with a description of the endoderm of the "brown" Sarsia (see the textfigs. 6 and 9). The endodermal epi- thelium of the manubrium is a columnar epithelium, consisting of long, narrow cells, visibly reaching from tlie supporting lamella to the gastric cavitv; tlic cells I - «> / -f-.'-l i â r'"''- '^â '1 "â * are .particularly narrowed at their base, where thev are prS^^Kâ â¢^ '^ ^ I I -. _^-\ f " . .. '. ' " â â¢â " ' Vl \ \ . \ I partly separated by interstitial cells. The epithelium is divided into 4 or 8 longitudinal ridges (4 broad inter- radial and 4 very narrow perradial) traversing very regularly the entire gonadial j^art of the manubrium, the ca\'ity of whicli is, thercl)}-, emphatically cross- shaped. The longitudinal ridges are interrupted by a number of sharp but usually not very deep transversal folds; this transversal folding is, however, highly dependent on the state of contraction of the manubrium (see textfig. 11). â In the "blue" Sarsia (textfigs. 8, 10, and 12) as well as in the "scarlet" form (textfig. 13) the gastral cavity is likewise cross-shaped in section, divided I)y 4 inter- radial ridges, but the latter are very irregularly shaped and very deeply and densely transversally folded; special perradial ridges cannot l)e distin- FiS. y. i-iu. 10. Figs, yâ10. Sarsia tuhulosn. Longitudinal of ma- nubrium. â Fig. 9. Specimen of "brown ; from the North Sea. â Fig. lo. Specimen of "blue ; from the Please note that these images are extracted
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
