58 HYDROIDA 



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



Taf. II, Fig. i. 

 1911 rigidum? + Eudendrium ramosum, Ssemundsson, Bidrag til Kundskaben om de is- 



landske Hydroider, p. 74 75. 



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

 of 200 mm. The small branches are annulated 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 polyps. The female gonophores are pear-shaped, and are borne on the 

 bodies or the hydrocauli of polyps that may either be fully developed, or somewhat smaller than the 

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



Material : 



"Ingolf" St. 21. 58oi' N. lat. 4445' long W. Depth 1330 fath. 24 C. 



31. 6635' 5554' 88 i6 , 

 44. 6i 42 ' 9 3 6' 545 4 8 



Greenland: Davis Strait Depth 80100 fath. 



Henry Land, East Greenland 20 



Cape Tobin 57 



Iceland: 6 miles west of Iceland 22 



Stykkisholtn 2030 



Faxebugt, 16 miles N.E. of Akranes ^Eudendrium ramosunf] 26 30 



Vestman Islands (^Eudendrium rigidum /") 30 



The Faroe Islands: Stokken 2 engl. miles S 22 E 55 



"Thor" 6ii5' N. lat. <$$' W. long. 872 in. 



"Diana" 61=40' - - 74o' - 135 fath. 



Store Fiskebanke (Large fishing-bank) 577' - - 24o' E. 37 

 The Kara Sea, "Djimphna". 



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

 cies Eudendrium ramosum (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 Eudendrium rameum, the appearance of which varies greatly 

 indeed. It has already been pointed out by Kramp (1911) that the species Eudendrium caricum 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 ramosum, now as Eudendrium sp. 



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



