54 



HYDROIDA 



Material : 



Greeiilaud, Egedesniinde (on Lcpcfa cocca). 



The species has been fonnd cliiefly along the west coast of Scandinavia. It is likely to occnr 

 nnich more frequently than might be believed from the scattered data. On account of its small 

 dimensions, and as, besides, it prefers settling on living, smaller molluscs, it too often escapes the 

 attention of the investigators of hydroids. Perigoiiiiiiiis abyssi has been found at Bohuslan and 

 on the west coast of Norway, from Stavanger as far as the Trondhjemfjord, at the depth of loo 

 —600 metres. On the north side of Beeren Island it has been met with at the depth of 165 



Text-fig. Q. The finds of Perigonhnus abyssi in the Northern Atlantic. 



metres (Bonne vie 1899). In Arctic regions it may occur in considerably shallower waters. Thus the 

 German expedition to vSpitzbergen in 1898 found the species in the Storfjord at the depth of between 

 o and TO metres (Broch 1909), and certainly it is the same species that is recorded by Kramp (1911), 

 l)y the name of Pcrigoniiiius sp., from the depth of 20 — 40 metres at a couple of stations of the "Dan- 

 mark" Expedition. To the localities previously recorded must now also be added the west coast of 

 Greenland near Egedesniinde. — According to the data in hand, the species must be characterized as 

 Arctic and boreal (Text-fig. Q). 



Perigonimus roseus (M. Sars) Bonnevie. 

 1874 Rhizoragiuin roscutii, M. Sars in: G. O. Sars, Bidrag til Kundskaben om Norges H}droider, p. 96. 

 1892 Garveia groenlandica, Levinsen, Meduser, Ctenophorer og Hxdroider fra Gronlands Vestkyst, p. 13. 

 1898 Perigonimus roseus^ Bonnevie, Neue norwegische Hydroiden. 

 191 1 Garvcia grocnlandica, Kramp, Danniark-Ekspeditionen til Gronlands Nordostkyst, p. 363, pi. XXV, fig. 6. 



