. Die dänische Ingolf-Expedition. Marine Tiere - arktischen Regionen; Wissenschaftliche Expeditionen; arktischen Regionen. OCTOCORALLIA 21 90 °70* 60' 50" bis "J 0" 70" 10" 0'10 "ZO" 30 "W50" "70" S  £ 0". Abb. 20. Eine CtiiiluLiiulon iraiuteU JiiiigL 'isi' II.  ¢ Acanthoijonjia annala Verrill. codiae wurde de. scril) (.â (! Wie ilistiiictlv blass-Rot, die Farbe in den Mustern in Alkohol ist jetzt grevish oder Hellbraun. Im Auftrag der sjiecimens anthocodiae sind ein]) es anscheinend zu eng in gleicher Höhe einstellen. In mehr erweiterte Exemplare, der Stiel ist verlängert,

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. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. OCTOCORALLIA 21 90° 70* 60' 50" tO" J0'70" 10' 0' 10" ZO" 30" W 50" GO" 70" S £0". Fig. 20. A CtiiiluLiiulon iraiuteU JiiiigL'isi'ii. ⢠Acanthoijonjia annala Verrill. codiae was de.scril)(.â (! as ilistiiictlv pale-red, their colour in the specimens in alcohol is now grevish or light brown. In contracted sjiecimens the anthocodiae are a])parently closely set in equal height. In more extended specimens, how- ever, the stalk is lengthened, especially in the centre of the colony, and the anthocodiae are then ]3laced more scattered. The lowest and outermo.st placed anthocodiae are moreover also the shortest, and thus in the most extended specimens the tentacle crowMis become quite free of each other. The largest anthocodiae measure aWoul II mm m height, tiie large.st tentacles a little more than 3 mm. Latero-ventral on each side of the tentacle there are aliout twentv slendiT ))innulae in a single row. The anthocodiae of the Xeniidae are usually de.si'ril)ed as non-retractile, a statement which often al.so is used in the iliagnosis of the faiiuly. Hickson (1931 ). 13S) states, however, aliout the anthocodiae that '"there can be no doubt that they all possess considerable powers of contraction." This species shows power of complete retraction of the anthocodiae and also a consideralile power of contraction of the entire colony. In one of the present colonies thus most of the anthocodiae are completely retracte<l, and JuNGERSEN (1917 p. 9) writes about the .specimens from the Bergen Museum that "in two ca.ses the upper nal<cil part of the stem with all its polyps was found retracted into ami cim- cealed in the "horny" part, " a very interesting statement wliiili lias been quite overlooked by the later .students of the Xeniidea. I'robably the retraction of the anthcx-odiae i

Stockbilder mithilfe von Tags suchen

• bookcentury1800
• bookdecade1890
• booksu
• bücherubjectarcticregionen