. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ACTINIARIA Z7 nemathybomes, seen from the surface, in a very extended specimen. In contracted animals the nema- thybomes are still more closely packed (textfig. 26). The nematocysts of the nemathybomes are of two sizes, partly 36—53 x , partly 62—74 X 5/^, the latter are often a little curved; one part of the nematocysts appears granulated. The nematocysts of the tentacles are 17—19 X to almost z ji, their spirocysts 11—14 X i-—1.*5 (2) {i. The nematocysts of the actinopharynx are partly 22—26 X —2/i, partly 29—3
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ACTINIARIA Z7 nemathybomes, seen from the surface, in a very extended specimen. In contracted animals the nema- thybomes are still more closely packed (textfig. 26). The nematocysts of the nemathybomes are of two sizes, partly 36—53 x , partly 62—74 X 5/^, the latter are often a little curved; one part of the nematocysts appears granulated. The nematocysts of the tentacles are 17—19 X to almost z ji, their spirocysts 11—14 X i-—1.*5 (2) {i. The nematocysts of the actinopharynx are partly 22—26 X —2/i, partly 29—36 x //. The siphonoglyphe is provided with longer cilia than the other part of the actinopharynx. The 8 "frfzefarrfsia-mesenteries" are well-developed, the other 8 mesenteries in the uppermost part of the column are also distinct. I have before described and reproduced the former (Carlgren 1893 PI. 2 figs. 5—8) from different parts of the body. The longitudinal muscle-pennons are in trans- verse-sections somewhat elongated and show, at most, about 20, commonly 14—17 folds. They are especially high in the outer and also in the inner part and rather richly ramificated; between these folds there are shorter ones, simple or a little branched (textfig. 28 transverse-section through the upper part of the cnido-glandular tract). The outer lamellar part of the mesenteries is at- tached to the pennon rather close to the outside. The parietal muscles of the same tract show rather numerous folds, a little branched and attached to thickish off-shoots of the mesogloea, the main lamella of the mesogloea is likewise in the outer part thick (textfig. 29). The expansion of the parietal muscles on the column is the ordinary one. Remarks. I have before (1893) described this species as a variety of E. clavata. A closer examina- tion, particularly of the distribution of the nemathybomes, however, proves that it is well differentiated from the species, called by mys
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscienti, bookyear1921
