. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fisf. XXXIl. Ni-tmrtt'sia rnmosa juv. <;. Young colony from "Ingolf St. 55 (nat. size), b. hydrocladial internode from the same colony (X8o). c. apophyse from the same colon}'(X So), d. colony from "Ingolf St. 85 (nat. size', e. apo- b physe from the colony from St. 85 (X 80). features of considerable interest. The distal part of its ramifications exhibits the same structure as Nemertesia antcnnhia, having, inside the homogeneous peridermal chitinous^sheath, coenosarc strings;
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. Fisf. XXXIl. Ni-tmrtt'sia rnmosa juv. <;. Young colony from "Ingolf St. 55 (nat. size), b. hydrocladial internode from the same colony (X8o). c. apophyse from the same colon}'(X So), d. colony from "Ingolf St. 85 (nat. size', e. apo- b physe from the colony from St. 85 (X 80). features of considerable interest. The distal part of its ramifications exhibits the same structure as Nemertesia antcnnhia, having, inside the homogeneous peridermal chitinous^sheath, coenosarc strings; these parts of the stem are thus canaliculate. Farther down, however, we find secondary tubes closely arranged about the primary stem tube, and the nearer we come to the base, tlie closer is the network and the thicker the stem. Where these secondary tubes occur, they co\er the apophyses more and more, finally burying them altogether, while the hydrocladia here also fall away. Consecpieutly, the basal part of well-developed colonies of A^cmertesia ramosa lacks hydrocladia, wherel^y the colon)- assumes a highly peculiar appearance. At a couple of the "Ingolf" stations, some quite small colonies of Nemertesia. ramosa were found; these serve well to show the difficulty of distinguishing the young stages from Plumnlaria (fig. XXXII). The smallest colony [a] is altogether pinnate; the thin stem is divided into irregular internodia with a varying number of apophyses, but closer investigation shows that the apophyses do not form two regular longitudinal rows, being as a matter of fact alternatel\' somewhat displaced to one side or the other, so that we have here a slight approach to quadriserial arrangement. A some- what larger colony (</), where the stem is slightly thicker, reveals more clearly the displacement of 9*. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
