. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ACTINIARIA 99 {sp.) in the different regions of two specimens {a. specimen from Nordre Stromfiord, b. specimen taken by Fasting). They differ considerably in size from those of Peachia hastata and bockii. The size of the cap- sules was as follows: Column n. tentacles n. in spec, a 25—29 (34) x —4 ft 32—36 X 4—5 ^ in spec, b 25—29 x 3,5 29—39 x 4 (5) tentacles sp. 19—26 X 2,5 fl 17—22 x actinopharyns «. 35—41 X 4—5^ 29—41 (commonly 36) x 5 In the specimen a. the nematocysts were typical with invisible basal part to the
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. ACTINIARIA 99 {sp.) in the different regions of two specimens {a. specimen from Nordre Stromfiord, b. specimen taken by Fasting). They differ considerably in size from those of Peachia hastata and bockii. The size of the cap- sules was as follows: Column n. tentacles n. in spec, a 25—29 (34) x —4 ft 32—36 X 4—5 ^ in spec, b 25—29 x 3,5 29—39 x 4 (5) tentacles sp. 19—26 X 2,5 fl 17—22 x actinopharyns «. 35—41 X 4—5^ 29—41 (commonly 36) x 5 In the specimen a. the nematocysts were typical with invisible basal part to the spiral thread; in the specimen b. the basal part was discernible. Probably tliis difference is due to the preservation of the cap- sules. The nematocysts are numerous in all regions; the spirocysts of the tentacles comparatively few. The endodermal circular muscles of the column are rather strong, but form no spliincter. The ectoder- mal longitudinal muscles of the tentacles are well developed. The ectoderm of the siphonoglyphe is de- void of nematocysts, and its albumen-cells are few in comparison with those of the actinopharjmx, which has no longitudinal muscles. The number of the mesenteries is that typical of Peachia. In one specimen one dorso-lateral pair of mesenteries is weak and a little coalesced with the actinopharynx. It is expanded in aboral direction a short distance below the actinopharynx (compare below the description of a young specimen of Peachia hastatal) The muscles of the mesenteries mainly are of the same appearance as in other Peachia species. The longitudinal muscles, however, form no concentrated pennons in the region of the glandular streak, but are spread over almost the whole breadth of the mesenteries (textfig. 127), wlierefore the pennons look more like a ribbon. The folds are rather high and mainly of about equal height, here and there with certain inter- spaces; there are, however, also lower folds. In transverse-sections
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscienti, bookyear1921
