. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 46 ZOANTHARIA iTr^ oval-shaped and with granular contents of close-lying grains (PL 7. fig. 1). The whole mesoglcea with exception of the very innermost part is incrusted. The entoderm is moderately developed, sometimes darkly pigmented. The sphincter is long and strong, in the distal part it forms a few deep folds, in the proximal numerous but small folds. The ectoderm of the tentacles contains numerous spirocysts, whereas the thick-walled capsules (length about 22//), are very scarce. Th
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. 46 ZOANTHARIA iTr^ oval-shaped and with granular contents of close-lying grains (PL 7. fig. 1). The whole mesoglcea with exception of the very innermost part is incrusted. The entoderm is moderately developed, sometimes darkly pigmented. The sphincter is long and strong, in the distal part it forms a few deep folds, in the proximal numerous but small folds. The ectoderm of the tentacles contains numerous spirocysts, whereas the thick-walled capsules (length about 22//), are very scarce. The mesoglcea is richly incrusted. The ectoderm of the resophagus is very high and contains numerous nematocysts 24—26/i long and thick-walled; further, there is a sparse occurrence of larger or smaller nematocysts with coiled thread as in the filaments. The mesoglcea is thin though however thickened in the siphonoglyphe. The number of mesenteries varied in the two specimens examined between 34 and 38. In both specimens the one side had one mesentery more than the other. The macro-mesenteries are rather thick even in specimens with ex- panded mesenteries, whereas the micro-mesenteries are weak and in the lower part of the oesophageal region extend a little over the main part of the entoderm of the body-wall. In specimens having the mesenteries contracted broadwise the longitudinal musculature lies in deep folds even extending below the oesophagus (Text-fig. 6). The parieto-basilar muscles are very weak. The distribution of the longitudinal musculature on the body-wall is fairly considerable, whereas hardly any parieto-basilar muscles occur. Below the oesophagus extend the mesenteries, which contain the undeveloped sexual organs reaching some way iuto tlie gastrovascular cavity. The filaments have the usual structure. Two kinds of nematocysts with greatly twisted thread and often of a somewhat curved shape occur, the one kind larger 37—53/« long and 10—i2/i broad, the other
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
