. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 48 HYDROIDA II Greenland: Sukkertoppen, on Boltenia (without further details). Iceland: Brunnes, depth 4 fathoms Seydisfjord — 6 — Hvalfjord — 46 metres Stykkisholm — 30 fathoms. The Faroe Islands: 6 miles N. by W. of Store Kalso, depth 60 fathoms Deep hole at north point of Nolso — 100 — Glyversnses near Thorshavn, on red algse. There may be some possibility that the colony here shown (fig. XX) from the "Ingolf" St. 87 does not altogether agree with Halecium tenellum. On comparing with the des- criptions given by
. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. 48 HYDROIDA II Greenland: Sukkertoppen, on Boltenia (without further details). Iceland: Brunnes, depth 4 fathoms Seydisfjord — 6 — Hvalfjord — 46 metres Stykkisholm — 30 fathoms. The Faroe Islands: 6 miles N. by W. of Store Kalso, depth 60 fathoms Deep hole at north point of Nolso — 100 — Glyversnses near Thorshavn, on red algse. There may be some possibility that the colony here shown (fig. XX) from the "Ingolf" St. 87 does not altogether agree with Halecium tenellum. On comparing with the des- criptions given by Hincks (1868 p. 226, pi. 45, fig. lc), Rit- chie (1907 p. 525), and Jaderholm (1909 p. 14) the gono- thecse do not agree with those shown. Hincks describes them as follows: "the capsules vary in form, being broadly ovate, or slender and somewhat pointed above; they contain a single, large gonophore". His figure shows us a slenderly oval or more pear-shaped gonotheca broadly rounded at the distal end. Ritchie's description is as follows: "The gon- angia are ovate, broad in the proximal region, obtusely pointed in the distal. They are supported on short stalks, which arise from the sides of the hydrotheea, and always from the lowest segment in any hydrotheea tier". Jaderholm writes: "Go- notheken eirund, unter den Hydrotheken ausgehend nnd (nach Thomely) auch von der Hydrorhiza uud aus der Hydro- thekenmiindung. Distale Zahne fehlen". From the statements here quoted, it is not easy to gain a clear impression of the gonangia, and none of them will altogether cover the present fertile colonies, of which there are not a few in my material, and which agree with the specimen shown. The gonotheca^ are here set on short stalks, close under the primary hydrothecae, or may exceptionally arise from the interior of the same; this agrees with the statements given above, as also with a later observation by Ritchie (1911 p. 30) where however, nothing n
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