24 
abundance,  partly with gonothecæ), near Godhavn, Disco, Stat. 113 a 
fa few small colonies, ringed furrows on the hydrothecæ, comp. 
Kramp 1911). — I still consider this form as an independent 
species, so long as transitional forms have not been found. Al- 
though I am sure, that S. gigantea has derived in older time from 
S. polyzonias, it seems to me to be separated sufficiently far from 
the primitive tribe as to keep the name of an independent species. 
Probably circumpolar; from the Bering Strait it spreads south- 
wards along Kamtschatka to the Korea Strait. Also said to be 
found in the Antarctic (Billard). 
Sertularella tamarisca (Linné) Levinsen. 
Sertularia  tamarisca Linné 1747. 
Dynamena — Fleming 1828. 
Diphasia — L. Agassiz 1860—62. 
— — Hincks 1868. 
Sertularella — Levinsen 1892, 
Two colonies, 6.5 and 7 cm.,. without gonothecæ, Store Helle- 
fiskebanke off Holstensborg, Stat. 100, depth 319 m. 
The species is an inhabitant of the arctic and boreal parts 
of the Atlantic area, known in the Arctic from Labrador to the 
Murman coast and off the Atlantic coasts of the northern America 
and Europe. 
Diphasia abietina (Linné) Levinsen. 
Sertularia abietina Linné 1767. 
Hincks 
1868. 
Alkeknarik —  KKirchenpauer 1884. 
Diphasia — Levinsen 1892. 
— —  Jiderholm 1909. 
Levinsen included this speciés in his list of the hydroids 
of West Greenland with the remark that it was not yet found in 
Greenland waters, but undoubtedly did live there. Jåderholm 
records it from Lat. 689 24' N, on the west coast of Greenland and 
from South Greenland. — The "Tjalfe" has taken it at five stations 
between Godthaab and Egedesminde: in Godthaab Fjord, Stat. 52 
