Report on the Hydroids. 385 



Calycella syringa Levinsen 1892 [38] p. 175 & 180. 



Markt.-Tnrn. 1895 [43] „ 411. 



Campanulina „ Bonnevie 1899 [13] ,, 74. 



Calycella „ Schydlowsky 1901 [52] „ 146. 



„ Jäderholm 1909 [35] ,. 80. 



Campanulina „ Broch 1909 [17] „ 164 & 213. Textfig. 22. 



This widely distributed species is very common at several of the 

 stations of the Danmark Expedition, especially in quantities on 

 Delesseria together with Campaimlaria intégra; nor is it seldom on 

 hydroids etc. Curiously enough it is absent from the rich station 68 a, 

 though Delesseria is present at this station; it should be remarked 

 that Campaimlaria intégra is rare at St. 68 a. The specimens from 

 St. 99 (depth 300 m.) are attached to the cirri of Hathrometra (An- 

 tedon) prolixa (Sladen). 



Renovation up to 4 times. The stalks may be very long; I have 

 seen a pedicel with even more than 20 windings; this applies espe- 

 cially to the stations 66 and 72 с 



The operculum is formed from the peripheral part of the original 

 hydrothecal roof (see p. 380—381 and PI. XXVI, figs. 7—14). 



Gonosomes of very fre([uent occurrence. 



Hab.: St. 21, 63, 66, 69, 71a, 72c, 95a, X, 99. 



Depth: 6 — 300 m., most abundant at 20 — 40 m., seldom at 

 greater depths. 



Geographical distribution: Arctic: circumpolar. — The 

 coasts of Europe and North America, Red Sea, Yellow Sea, Hawaii. 

 — Subantarctic : Burdwood Bank. 



Not earlier known from East Greenland. 



Genus Tetrapoma Levinsen. 



Tetrapoma quadridentatum (Hincks) Levinsen. 

 Plate XXIV, fig. 15. 



Calycella quadridentatum Hincks 1874 [29] p. 149. Pl.VIII, figs. 



17—20. 

 Thompson 1884 [56] „ 7. PI. I, fig. 20. 

 Tetrapoma „ Levinsen 1892 [38] „ 175 <& 180. 



Schydlowsky 1901 [52] „ 146. 

 Lovenella quadridentata Broch 1909 [17] „ 166 & 214. Text- 



fig. 24. 

 A number of hydrothecae of this purely arctic species were 

 found on Sertularella tricuspidata from St. 71 a. 



Renovation twice. The operculum is formed from the whole of 

 the original hydrothecal roof, which is divided into four free valves 



