58 



HYDROIDA 



1908 Eudendrium caricnin, Jaderholm, Die Hydroiden des Sibirischen Eismeeres, p. 5, Taf. I, Fig. 4, 



Taf. II, Fig. I. 

 igii — rigidum? + Eiidciidriniii raiiiosuvi, Ssenuuidsson, Bidrag til Kundskaben om de is- 



landske Hydroider, p. 74—75. 



The strongly and irregnlarly branclied 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, 

 bnt are elsewhere smooth. The polyps have abont 20 tentacles. There is no particnlarly developed 

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

 ing organs. 



The gonophores are styloid. The male gonophores have 2 — 4 chambers and are seated ronnd 

 the base of fnlly developed polyps. The female gonophores are jDear-shaped, and are borne on the 

 bodies or the hydrocanli of polyps that may either be fnlly developed, or somewhat smaller than the 

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



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 — 



Faxebngt, 16 miles N.E. of Akranes i^^Eiidciidriiun raiiiosuiir) — 26 — 30 ■ — 



Vestman Islands {^'■Eudendrium rigidum ?") — 30 — 



The Faroe 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' - — — ^35 fath. 



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

 The Kara Sea, "Djimphna". 



This common northern species has, no doubt, frequently been confused with the southern spe- 

 cies Etidetidrium ramosuDi (Lin.), 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 waters, are to be 

 regarded as referring to specimens of Ejidendriui/i rai/inii/i, the appearance of which varies greatly 

 indeed. It has already been pointed out by Kranip (1911) that the species Eudendrium caricuiu 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 Eudendrium rameum and Eudendrium raii/osum^ now as Eudendrium sp. 



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



