. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ZOANTHARIA 37 appearance and inner structure, that there can be no doubt that they represent 2 species quite different from each other. var. fan mayeni PI. 2 fig. 2. Through the kindness of Prof. Marenzeller, I have had the opportunity of examining the specimens from Jan Mayen which he considered Palythoa norvcgica. They could not be referred to this species with absolute certainty, but may well be considered as a variety of E. glactalis, from which they differ but little, mostly with regard to the uematocysts which are gene
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ZOANTHARIA 37 appearance and inner structure, that there can be no doubt that they represent 2 species quite different from each other. var. fan mayeni PI. 2 fig. 2. Through the kindness of Prof. Marenzeller, I have had the opportunity of examining the specimens from Jan Mayen which he considered Palythoa norvcgica. They could not be referred to this species with absolute certainty, but may well be considered as a variety of E. glactalis, from which they differ but little, mostly with regard to the uematocysts which are generally somewhat larger than in the main form. Occurrence. See above under the main form. Dimensions. Length of the largest polyp r2 cm., breadth in the capitular region 07 cm. Colour in alcohol. Ectoderm uncoloured. Mesoglcea interspersed with black sand-grains. External appearance. 1 colony consisting of 2 polyps, which lie close to each other projecting from a thin ccenenchyme (fig. 2 PL 2). In the con- tracted state the polyps are elongated, cylindrical somewhat broader at the upper end and with rounded capitular region. The capitular furrows are very distinct, in the smaller specimen I counted 21, in the larger 24. The siphonoglyphe is well developed. Anatomical description. The ectoderm of the body-wall is continuous, very high and thicker Text-fig. 5. Transverse section through the body-wall with than the mesoglcea, in which we frequently find broad adjacent mesenteries and oesophagus of Epizoanthus glaciate uematocysts with greatly twisted thread (length 34-36/A (sPec"™^ dredged by C Nys tr 6 m). Mesoglcea and J ° J ' muscles black. Ectoderm not drawn and entoderm only breadth 12 — 13//). Incrustation of small Saud-graillS. in part, dc directive chamber. In the mesoglcea of the .... bodv-wall the incrustations are marked bv dots. Otherwise like the main form. While the spirocysts in the ectoderm of the tentacles were very numerous, the thick-walled capsules only
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscienti, bookyear1913
