Hydroids (Cnidaria, Hydrozoa) of the Danish expedition to

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182 about 0.3 mm. Hydrothecal opening in frontal view elliptical, margin with three shallow teeth: two lateral ones and one median adcauline, opcerculum one oval valve attached on abcauline side of hydrothecal rim, often repeated. Hydranth without abcauline caecum, with about 20 tentacles. Gonothecae on stem and hydrocladia, all on one side, held perpendicular to plane of ramification. Gonothecae globular to urn-shaped, length 1 mm, diameter in middle 0.75 mm, aperture wide, 0.5 mm diameter, on short neck, operculum convex, on inside of neck a ring of perisarc projections. Distribution Vietnam, Indonesia, Australia, India, Japan. Type locality: Australia. P. SCHUCHERT Caminothujaria molukkana von Campenhausen, 1896 Fig. 38. Caminothujaria molukkana von Campenhausen, 1896a: 104. – Vervoort 1993: 102, synonymy. Caminothujaria moluccana. – von Campenhausen 1896b: 306, pl. 15: fig. 8. Thuiaria divergens Whitelegge, 1899: 372, pl. 22, figs 1–3. – Billard 1925b: 222. Sertularia indomalayica Stechow, 1919: 158. Sertularella singularis Billard, 1920a: 14, fig. 1. Sertularia sigmagonangia Hargitt, 1924: 495, pl. 5: fig. 20. Sertularella moluccana. – Billard 1925b: 167, figs 28–29, pl. 7: fig. 19. Dictyocladium aberrans Nutting, 1927: 214, pl. 41: figs 4–5. Material examined: Kei Islands Expedition stations: 21. – 26. – 27. – 53. – 54, with gonothecae. – 68. – 103. Description Colonies erect, pinnate, up to 7 cm high. Stolons Fig. 38. Caminothujaria molukkana von Campenhausen, 1896; A, station 53; B–E, station 26. A. Colony silhouette. B. Part of stem and base of hydrocladium. C. Paired hydrothecae. D. Verticil with four hydrothecae, opercular valves drawn dotted. E. Gonotheca in side view, same scale as B. – Scales: A = 1 cm; B, E = 0.5 mm; C = 0.2 mm; D = 0.4 mm.
HYDROIDS OF THE DANISH EXPEDITION TO THE KEI ISLANDS root-like or creeping. Stems unforked, monosiphonic in younger colonies, older colonies polysiphonic in lower half; with alternate hydrocladia which are more or less in one plane, nodes along stem absent or very indistinct. Hydrothecae of stem in two lateral rows, in groups of three close to origins of hydrocladia, one hydrotheca opposite hydrocladium, one axillary, one below hydrocladium; end of adcauline wall of stem hydrothecae often with process. Hydrocladia alternate, straight, occasionally branched secondarily, held at right angle to stem, can be long but length variable, with up to 24 hydrothecal pairs or verticils, nodes rare. Hydrothecae of hydrocladia either in opposite pairs (rarely subopposite), or in verticils of three or four; paired hydrothecae in plane of colony. Verticils with 3–4 hydrothecae more frequent near proximal end of hydrocladium, more distal hydrothecae usually in pairs. Hydrotheca uniform, curved so that openingplane is nearly parallel to hydrocladium or somewhat inclined towards above, adcauline wall adnate for half its length or less, abcauline wall about 0.45 mm long, diameter of opening 0.22 mm; rim with four low but acute cusps (two laterals, one adcauline, one abcauline); operculum composed of four valves, pyramid-like; renovations of margin frequent, lower end of adcauline wall often with swelling, this swelling variably present, sometimes this swelling extended like an annular thickening. Hydranths with abcauline caecum. Gonothecae on hydrocladia, long axis parallel to hydrocladium, shape elongate-fusiform and slightly S-curved, about 2 mm long, maximal diameter 0.6 mm; body with 6–8 sharp transverse crests; opening terminal, rather small, surrounded by three distinct cusps, one adcauline, two laterals; opening covered by operculum divided into four flaps. Remarks With its four-cusped hydrothecae in either opposite pairs or verticils of three or four, this species is easily recognizable. Juvenile colonies may have only paired hydrothecae. 183 Distribution Indonesia, Philippines, Ellis Islands. Type locality: Ternate, Moluccas, Indonesia. Sertularella decipiens Billard, 1919 Fig. 39. Sertularella decipiens Billard, 1919b: 21, fig. 3B. – Billard 1925b: 155, fig. 21, pl. 7: fig. 15, pl. 8: fig. 34. – Watson 2000: 27, fig. 22A–E. Material examined: Kei Islands Expedition station 11, with gonothecae. Fig. 39. Sertularella decipiens Billard, 1919. A. Stem internode with base of hydrocladium. B. Part of hydrocladium. C. Gonotheca, same scale as A. – Scales: A, C = 0.5 mm; B = 0.2 mm
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Hydroids (Cnidaria, Hydrozoa) of the Danish expedition to

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