. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 6i Textfigs. 73—75. Milne-Edwardsia loveni. Fig. 7j. Transverse section of pennon in the upper part of the reproductive tract. Fig. 74. Transverse section of a portion of capitulum with a parietal muscle. Fig. 75. Transverse section of a portion of the capitulum n: nematocysts. ing to the insertions of the mesenteries. The actinopharynx is short, with 8 longitudinal ridges and as many longitudinal furrows. The siphonoglyphe is ventral, indistinct, about twice the breadth of the
. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ACTINIARIA 6i Textfigs. 73—75. Milne-Edwardsia loveni. Fig. 7j. Transverse section of pennon in the upper part of the reproductive tract. Fig. 74. Transverse section of a portion of capitulum with a parietal muscle. Fig. 75. Transverse section of a portion of the capitulum n: nematocysts. ing to the insertions of the mesenteries. The actinopharynx is short, with 8 longitudinal ridges and as many longitudinal furrows. The siphonoglyphe is ventral, indistinct, about twice the breadth of the other longi- tudinal furrows in the actinopharynx. Anatomical description: The scapus-ectoderm is high, especially in the proximal part and on the ridges, and several times thicker than the mesogloea; also in the distal parts it is higher than the meso- gloea. The nematocysts are few in number between the ridges, on these latter very numerous but scattered and do not seem to form any such groups as in They are most frequently a Uttle curved, with rather indistinct basal part to the spiral thread which follows the whole length of the capsules, and they are 36 —48 X 6/i in size. Further down there are also smaller capsules, about 24 // long. The cuticle of the 1 .. ">.^:^^xy - ' Fig. 74. scapus is ver>' -. --^ >.- thick, the outer part of it is rather easily loosened from the under- lying, thinner substitutive-cu- ticle, and is a little incrustated. The ectoderm of the capitulum is in the ridges high, with numerous nematocysts, 22—^o ft long and 4,u broad; in the furrows lower, with very few nematocysts (textfig. 75). The mesogloea is much thicker on the ridges than in the furrows, where it is rather thin. The endodermal circular muscles are weak and form no sphincter. The ectoderm of the tentacles contains ver>' numerous nematocysts, about 22 X 4 // in size, and spirocysts of variable length; the largest are of about the same size as the nematocy
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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectarcticregions
