58 



HYDROIDA 



1908 Eudendriuin caricuni, Jaderholm, Die Hydroideii des Sibirischeu Eismeeres, jj. 5, Taf. I, Fig. 4, 



Taf. II, Fig. I. 

 jgii _ rigidum? + Eudendriioti rainosum, Ssenmiidsson, Bidrag til Kiuidskaben ora de is- 



landske Hydroider, p. 74—75- 



Tlie strongly and irregularly branched colonies have a fascicled main stem, and attain a height 

 of 200 mm. The small branches are annnlated immediately above their rise from the mother branch, 

 but are elsewhere smooth. The polyps have about 20 tentacles. There is no particularly developed 

 ring of stinging cells round the tentacles or the polyp body. The colonies have no particular sting- 

 ing organs. 



The gonophores are styloid. The male gonophores Have 2—4 chambers and are seated round 

 the base of fully developed pol}'ps. The female gonophores are pear-shaped, and are borne on the 

 bodies or the hydrocauli of polyps that ma>' either be fully developed, or somewhat smaller than the 

 sterile polyps, or entirely reduced. The spadix is nnbranched. 



Material: 



"Ingolf" St. 21. 58°oi' N. lat. 44°45' long W. Depth 1330 fath. 2°4 C. 



- - 31. 66°35' - - 55°54' - - - 88 - i°6 - 



- - 44. 6i°42' - - 9°36' - - _ 545 _ 4°8 - 



Greenland : Davis Strait Depth 80—100 fath. 



Henry Land, East Greenland — 20 — 



Cape Tobin — 57 • — 



Iceland: 6 miles west of Iceland — 22 — 



Stykkisholm — 20—30 — 



Faxebugt, 16 miles N.E. of Akranes {^Eiidri/Jn'iiii/^ /■auiosiii/i'^) — 26 — 30 — 



Vestman Islands ^Eudendriuin rigidiiiii ;"') — 30 — 



The I\'iroe Islands: Stokken 2 engl. miles S 22 E — 55 — 



"Thor" 6i°i5' N. lat. 9^35' W. long. — 872 m. 



"Diana" 6i°4o' - - 7^40' - — — 135 fatli. 



Store Fiskebanke (Large fishing-bank) 57°7' - - 2°4o' E. — — 37 — 

 The Kara Sea, "Djimphna". 



This connnon nortliern species has, no doubt, frequently been confused with the southern spe- 

 cies Eudendrium ramosuin (Liu.), which, in fact, is rather rare in our northern seas. Assuredly enough, 

 nearly all the statements of the occurrence of the last-mentioned species in Arctic watens, are to be 

 regarded as referring to specimens of Eudendrium rainruiu, the appearance of which varies greatly 

 indeed. It has already been pointed out by Kramp (1911) that the species Eudendrium caricuin from 

 the Russian polar expedition, described by Jaderholm (1908), is, in fact, founded on specimens of 

 Eudendrium rameum. Surely enough, it is the same species which is recorded by Bergh (1887) now 

 as Eudendriuin rameum and Eudendrium raniosum^ now as Eudendrium sp. 



The species has a circumpolar distribution , and appears, from the statements of literature, to be a 



