25 
(several fairly small colonies), Lille Hellefiskebanke off Sukkertoppen, 
Stat. 422 (one small colony), Store Hellefiskebanke off Holstens- 
borg, Stat. 100 (tvvo colonies, 9 cm. and one, 13 cm., vvith many 
gonothecæ) and Stat. 371 (four colonies), 35 miles SW. of Ege¬ 
desminde, Stat. 107 (one fairly large colony). — Almost all the 
colonies are overgrown with Grammaria serpens and, in less quan- 
tities, with other hydroids. 
Circurapolar, penetrating far southwards into the warm areas; 
Jaderholm records it from Madeira, and it has been recorded 
even from the Southern hemisphere, viz. from South Africa (Busk) 
and South Georgia (Jaderholm 1910). 
Diphasia fallax (Johnston) L. Agassiz. 
Sertularia fallax Johnston 1847. 
Diphasia — L. Agassiz 1860—62. 
— — Levinsen 1892. 
Store Hellefiskebanke, Stat. 100 and 397 (some few small 
colonies, partly on Thujaria hippuris), 45 miles WSW. of Egedes¬ 
minde, Stat. 199 (one very large colony with many gonothecæ, 
the determination not quite certain). — Levinsen records the 
species from the Davis Strait and the Danmark Strait. — Occurs 
in the arctic and boreal parts of the Atlantic area. 
Sertularia tenera G. O. Sars. 
Sertularia tenera G. O. Sars 1873. 
— — Hincks 1874. 
— arctica Allman 1876. 
— tenera Levinsen 1892. 
? — Thompsoni Schydlowsky 1902. 
Taken near Fiskenæs, Stat. 465 (two small colonies, 2.5 and 
3.5 cm., the latter with gonothecæ), on Store Hellefiskebanke off 
Holstensborg, Stat. 100 (one colony, 3 cm. on a Pecten- shell). — 
Recorded by Levinsen from Frederikshaab and Egedesminde. — 
Circumpolar and subarctic. 
