HYDROIDA 



59 



200 m. boom. ... tooom. 2000m. 



Text-fig. S. The habitat of Eudendrium rameum in the Northern Atlantic. 



perfect cosmopolite. It occurs frequently everywhere in the middle and deeper parts of the litoral region 

 of the northern seas (Text-fig. S), and may, exceptionally, as in the "Ingolf" st. 21, also penetrate far 

 down into the abyssal reo-ion. 



Eudendrium ramosum (Linne) Ehrenberg. 

 1758 Tiihulan'a ramosa, Linne, Systema naturae, ed. X, p. 804. 



1834 Eudendrium ramosit?n, Ehrenberg, Beitrage zur physiologischen Kenntnisse der Corallenthiere, 



p. 296. 

 nee 1887 — , Bergh, Karahavets Goplepolyper, p. 332. 



nee 1911 — — , Saemundsson, Bidrag til Kundskaben om de islandske Hydroider, p. 74. 



The strongly branched colonies show an almost quite regular, alternating arrangement of 

 the small branches. The main stem is fascicled. The small branches are annulated above their rise 

 from the mother branch, but are elsewhere quite smooth. The polyps have about 20 tentacles. The 

 stinging cells are not accumulated in any particular main ring round the tentacles or the polyp body. 

 The colony has no particular stinging organs. 



The gouophores are styloid. The male gonophores have 2 — 3 chambers and are seated round 

 entirely atrophied polyps with short hydrocauli. The female gouophores are pear-shaped and borne 

 on the bodies or on the stems of polyps which are either fully developed or somewhat reduced as 

 compared to the sterile polyps. The spadix is unbranched. 



Material : 



Southeastern Iceland: (Honing) 1898. — Depth 52 — 49 fath. 



8* 



