. Ein Lehrbuch der wirbellosen Morphologie [microform]. Wirbellose; Morphologie (Tiere); Invertébrés; Morphologie (ANIMAUX). 84 wirbellose Morphologie. 2. Um Narcomedusae. In der Hydrarise der polyp Form auftritt, ohne dass ein Medusa, in der Reihenfolge, in der Narcomedusce ist das Gegenteil der Fall, da in ihm die Medusa Form der Einzige in einem typischen Stand der Entwicklung ist. Die MEDUSAE sind meist etwas objektiv-förmige Strukturen (Abb. 42), mit einem Gelappt Marge, das velum (v), anstelle eines horizontalen, hängend von der Mar-. (Nach Bpooks). V = velum. Abb. 42.- Ounoctantha octonaria Haeck. T

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. A textbook of invertebrate morphology [microform]. Invertebrates; Morphology (Animals); Invertébrés; Morphologie (Animaux). 84 INVERTEBRATE MORPHOLOGY. 2. Order Narcomedusae. In the Hydrarise the polyp form occurs without a medusa, in the order Narcomedusce the reverse is the case, since in it the medusa form is the only one present in a typical state of development. The medusae are usually somewhat lens- shaped structures (Fig. 42), with a lobed margin, the velum (v), instead of being horizontal, being pendent from the mar-. (After Bpooks). V = velum. Fig. 42.—Ounoctantha octonaria Haeck. TO = margin of bell. ot = otocyst. gin (m) and extending up in the intervals between the lobes. At the apex of each one of these intervals is situated a short, stiff, solid tentacle v/hich is usually bent backward over the exumbrellar surface and is tipped by a knob of nematocysts. The cavity of the short manubrium leads into a gastric chamber which is prolonged out towards the margin into broad pouches which lie opposite the tentacles and the intervals be- tween the lobes, and around the margin, following the edge of the lobes and therefore having a festooned arraugement, runs n narrow circular canal which communicates with each radial pouch at the apex of each interlobular interval. This struc- ture is, however, absent in the American species Ouiioduntha ocfonano, . The reproductive organs develop in the auburn- brellar ectoderm covering the pouches and sometimes extend on to the manubrium. Around the margin of the lobes are seated club-shaj)ed projecting otocysts (ot) composed of au external layer of ectoderm surrounding a number of endo- dermal cells, one or more of which contain a crystal of carbonate of lime. The ectoderm cells in the neighborhood are largely sensory and provided with long cilia, their inner ends contributing to the formation of the marginal nerve- ring.. Please note that these images are extracted from scanned page images that may have been digitally e

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• bookcentury1800
• bookdecade1890
• bookpublishernewyo
• bookyear1896