Hydroids (Cnidaria, Hydrozoa) of the Danish expedition to

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160 present in shallow waters of the tropical Pacific. Although von Campenhausen’s material was strictly pinnate, it is also unlikely that it belonged to Z. rufa because it was 12 cm high, it had branched stems, and the stems were dark-red to black. The available data are insufficient to identify it unambiguously. Distribution Great Barrier Reef, French Polynesia, Fiji Islands, Kei Islands (new record). Type locality: Holborne Island, Great Barrier Reef, Australia. Zygophylax sibogae Billard, 1918 Fig. 19. Zygophylax sibogae Billard, 1918: 21 fig. 1. – In part Totton 1930: 167, fig. 21. – Ralph 1958: 311, fig. 2e–i. – Millard 1975: 198, fig. 65A–C. – Rees & Vervoort 1987: 72. – Hirohito 1995: 144, fig. 45a–d, pl. 9: fig. D. Fig. 19. Zygophylax sibogae Billard, 1918; station 33. A. Part of stem and hydrocladium; hydrotheca in frontal view. B. Hydrotheca in side view. C. Nematotheca on apophysis bearing a hydrotheca. – Scales: A–B = 0.2 mm; C = 50 µm. P. SCHUCHERT Material examined: Kei Islands Expedition stations: 33. – 46. – 48. – 58; all infertile. Description Colonies erect, up to several cm high; stem polysiphonic, sometimes branched, composed of a primary tube and auxiliary tubes. Primary tube bears hydrocladia, hydrothecae and nematothecae. Hydrocladia alternate, monosiphonic, unsegmented, bearing alternate hydrothecae on apophyses. The two rows of hydrothecae not in one plane but borne on anterior surface, with an acute angle between them and with the hydrothecae of one row rotated so that they slightly face away from those of the other row. Hydrotheca slender and tubular below the diaphragm, then widening and strongly recurved, total height 0.6–0.8 mm, depth from upper margin to diaphragm 0.3–0.35 mm, diameter of opening 0.15 mm. The curved end is trumpetshaped and held perpendicular to the axis of the lower part of the hydrotheca, resulting in a deep fold on one side. Diaphragm well formed, with central hydropore. Nematothecae tubular, about 80–90 µm long, diameter 20 µm, on axial tube, accessory tubes at base of hydrocladia, and on apophyses of hydrothecae. Not all apophyses bear nematothecae. Gonothecae not observed (see Billard 1918 for description; figures are given by Hirohito 1995). Distribution Indonesia, New Zealand, South Africa, Japan. Type locality: Kei Islands, 5.667°S, 132.433°E, 310 m. Family Campanulariidae Clytia linearis (Thornely, 1900) Fig. 20. Obelia linearis Thornely, 1900: 453, pl. 44: fig. 6. In part Obelia bidentata var. – Pictet 1893: 25, pl. 1: figs 20– 21. [Not Obelia bidentata Clarke, 1875] Clytia longicyatha. – Pictet 1893: 28, pl. 2: figs 22–23. [Not Obelia longicyatha Allman, 1877] In part Clytia serrulata. – Pictet 1893: 30. Campanularia gravieri Billard, 1904: 482, fig. 1.
HYDROIDS OF THE DANISH EXPEDITION TO THE KEI ISLANDS Clytia gravieri. – Billard 1938: 429, figs 1–4. – Millard & Bouillon 1973: 51, fig. 7E–G. – Millard 1975: 215, fig. 71F–H. Clytia linearis. – Hirohito 1977: 14, fig. 4. – Cornelius 1982: 84, fig. 12, synonymy. – Rees & Vervoort 1987: 94. – Gibbons & Ryland 1989: 404, fig. 22. – Calder 1991: 62, fig. 34, synonymy. – Ramil & Vervoort 1992: 238, fig. 67b. – Hirohito 1995: 65, fig. 18h–i. – Migotto 1996: 85, fig. 16a–b. – Medel & Vervoort 2000: 38, bibliography. – Watson 2000: 73, fig. 57D–E. Material examined: Kei Islands Expedition, harbour pier of Ambon, 28 Feb 1922, 1 m, with gonothecae. – Kei Islands Expedition Stations: 40, no gonothecae. – 104, no gonothecae. – MHNG INVE 25045, as C. longicyatha, Bay of Ambon, Moluccas, material described by Pictet (1893), fertile, on Pennaria and other hydroids, alcohol and slide material. – MHNG INVE 31756, Ambon, coll. Pictet and Bedot 1890, colony with gonothecae. – MHNG INVE 31757, as Obelia bidentata, Ambon, on ascidians, several colonies, material described Fig. 20. Clytia linearis (Thornely, 1900); A–B, station 104; C, Kei Island Expedition, Ambon harbour. A. Hydrotheca. B. Hydrothecal opening seen from above. C. Gonothecae with medusae buds. – Scales: A–B = 0.2 mm; C = 0.5 mm. 161 by Pictet (1893), with gonothecae. – MHNG INVE 25040, as Clytia serrulata, Ambon, material of Pictet (1893), slide and alcohol material. Description Colonies erect, up to 1 cm high, branched, stem usually monosiphonic or rarely sparingly polysiphonic. Perisarc with short annulated stretches, especially at origin of side-branches or hydrothecal pedicels, otherwise smooth; branches originate at acute angle. Hydrothecae on pedicels formed by short side-branches, these pedicels usually annulated over larger part. Hydrotheca deep, depth 0.75– 1.0 mm, diameter about 0.35 mm, cylindrical, tapering at base, periderm thin and often folded or damaged in preserved material; diaphragm thin. Margin of hydrotheca with 10–12 narrow cusps, between them rounded embayments. Each cusp coincides with a sharp longitudinal inwardfold that is about 4 times as long as the cusp, becoming gradually shallower proximally. The folds are as narrow as the cusps and keel-like, the periderm is slightly thickened. This produces a distinct striation pattern along the hydrotheca (Fig. 20A). Gonothecae on stem, singly or in pairs, clubshaped, up to 1.2 mm long, maximal diameter 0.4 mm, end truncated, with a more or less distinct neck, pedicel annulated. Blastostyle with one or two rows of medusae buds. Medusae with hemispherical bell and four marginal bulbs. Remarks Clytia linearis and its extensive synonymy have been discussed repeatedly, e.g., by Hirohito (1977), Cornelius (1982), and Calder (1991). Re-examination of material described by Pictet (1893) as C. longicyatha clearly showed that it is indistinguishable from C. linearis (Thornely, 1900) as it is conceived today (e.g., Cornelius 1982, Calder 1991). Obelia longicyatha Allman, 1877 is insufficiently known and Cornelius (1975a) considered it to be conspecific with O. bidentata. Also at least some of the material identified by Pictet as O. bidentata clearly belongs to C. linearis. Pictet’s sample was re-examined for this study and it does not match the figure given by
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Hydroids (Cnidaria, Hydrozoa) of the Danish expedition to

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