. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HYDROIDA 29 "Ingolf" St. 40. 62°oo' N., 2i°36' W., depth S45 fathoms, + 3^ C. - 86. 65°o3'6 - 23°47'6 - 76 ? - 87. 65°o3'2 - 23°56'2 - — no ? - 106. 65°34' - 8°54' - 447 - o°6 C. - 127. 66°33' - 20*05' - - 44 + 5°6 - - 143. 62°58' - 7°o9' - 388 - o°4 - Of a type like that of Tubularia cornucopia Bonnevie from the localities: "Ingolf St. 11. 64°34' N., 3i°i2' W., depth 1300 fathoms, + i°6 C. - 18. 6i°44' - 3o°29' - 1135 + 3°o - "4T. Gen. Corymorpha M. Sars. Solitary hydroids, whose contractile hydrocaulus
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. HYDROIDA 29 "Ingolf" St. 40. 62°oo' N., 2i°36' W., depth S45 fathoms, + 3^ C. - 86. 65°o3'6 - 23°47'6 - 76 ? - 87. 65°o3'2 - 23°56'2 - — no ? - 106. 65°34' - 8°54' - 447 - o°6 C. - 127. 66°33' - 20*05' - - 44 + 5°6 - - 143. 62°58' - 7°o9' - 388 - o°4 - Of a type like that of Tubularia cornucopia Bonnevie from the localities: "Ingolf St. 11. 64°34' N., 3i°i2' W., depth 1300 fathoms, + i°6 C. - 18. 6i°44' - 3o°29' - 1135 + 3°o - "4T. Gen. Corymorpha M. Sars. Solitary hydroids, whose contractile hydrocaulus is surrounded by a flexible, thin, and membran- aceous perisarc. The hydrocaulus is attached to the substratum by numerous rhizoids. The structure of the polyp is radially symmetrical with two main whorls of tentacles, a proximal or basal whorl of long tentacles supported by a mesogloeal ring in the polyp body, and a distal whorl of short ten- tacles round the orifice. In the full-grown polyp all the tentacles are filiform; in the actinula larva at any rate the distal (oral) tentacles may be capitate. The gonophores are generally supported by blastostyles; the gonangia arise from the body of the polyp between the tentacle whorls. As early as 1909 I stated this limitation of the genus, grouping at the same time the species, on the ground of gonophoral matters, in four subgenera. However, I suggested that, as to the rela- tions between the two subgenera Monocaulus and Lampra, a closer inquiry was wanting. As a matter of fact, one of the species stated by A limau (1876) Monocaulus grocnlandica really proves to be identical with two of the species of La/upra stated by Bonuevie (1899). Also the other northern spe- cies of Monocaulus has met a peculiar fate, being first ranked by Allmau (1872) within his genus as Monocaulus glacialis (M. Sars), and afterwards (1876), after the examination of some specimens from the museum of Copenhagen, described as a new specie
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscientificexpedition
