. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 72 scapus is quite smooth. The scapus is in fact provided with scattered "//a/cam^a-papillae" to which small grains are sometimes attached in the proximal parts of the scapus (textfig. 87, PI. i, figs. 8, 9). The capitulum is polygonal and has 8 rather elevated longitudinal ridges between the insertions of the mesenteries. The tentacles of Lecythia are (according to Sars) 20, 25â26 in number, those of caniea, according to Appellof, some 20 to some 30. I have observed 2
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 72 scapus is quite smooth. The scapus is in fact provided with scattered "//a/cam^a-papillae" to which small grains are sometimes attached in the proximal parts of the scapus (textfig. 87, PI. i, figs. 8, 9). The capitulum is polygonal and has 8 rather elevated longitudinal ridges between the insertions of the mesenteries. The tentacles of Lecythia are (according to Sars) 20, 25â26 in number, those of caniea, according to Appellof, some 20 to some 30. I have observed 24â28 tentacles myself. The inner tentacles are longer than the outer ones, all short and of al)out the length of the capitulum, conical and hexamerously arranged in at least 3 cycles. Appellof says that there are only 2 cycles of tentacles oral disc is actino- pharynx is short, with 8 longitudinal furrows and the same number of longitudinal ridges. A feebly developed ventral siphonoglyphe seems to be present. Anatomical description: The physa is devoid of a periderm. The ectoderm contains numerous nematocysts, 8â15 ,« long. The scapus-ectoderm is high and covered witli a thin periderm. Its nematocj-sts are numerous and of two dimensions, partly comparatively broad 17- ner and about 8â12 n long. The mesogloea is of about the thickness of the ectoderm or thinner and almost homogeneous. The endoderm is a little lower than the ectoderm and contains numerous nemato- cysts (text fig. 89, 92 n), 34â38 X 5 /^ in size and often a Httle cur- ved ; these endodermal nematocysts make a characteristic feature of this species. I have observed such capsules also in the endoderm of the tentacles and of the actinopharynx. (Their size is 36â43 X 5 //)⢠The capitular ectoderm is high and provided with nematocysts which are smaller in the proximal parts (10â14// long), in the distal part, Fig. 87. Paraedwardsia sarsii. -'Vrrangement on the other hand, unt
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
