51 



Eutlendrium rameum. Fallas. 



Trophosome. Hydrocuulus sammensat, 7 — 20 cm. 

 hoi; Forgrening fuklstændig uregelmæssig. Hydranthbærende 

 Grene er enkle, med Ringe ved Udgangspunkt og af og 

 til ellers. Hydranthcrne er store med ca. 20 Tentakler. 



Gonosome. Han : Gonoforerne har som Regel 2 

 Kamre og udgaar radiært omkring ikke atrophierede Hy- 

 dranther. Hun: Pæreformede, sidder spredt over og 

 nedenfor ikke atrophierede Hydranther. 



Et Exemplar af denne Avi er den eneste Represen- 

 tant for Fam. Eudendridae, som blev fanden under Nordh.- 

 Exp. Kolonien er af Hunkjon, og ca. 12 cm. hoi. 



Findested. St. 315. 



Monobrachium parasiticum, Mereschkowsky. 



{Tah. III, Fig. 2). 

 84. 120. 



Trophosome. Hydrorhiza danner et tæt Netværk af 

 anastomoserende Tuber, d;ckket af chitinos Perisarc. Hy- 

 drocaulus rudimentær. Hydi-anth cylindrisk, 1 — 2 mm. hoi, 

 med 1 Tentakel, der sidder et Stykke nedenfor Munden, 

 og hvis Længde er 3 — 5 mm. Nær Hydranthens distale 

 Ende — ovenfor Tentakelens Udspring — tindes en Ring 

 af Nesleceller. 



Gonosome. Medusoide Gonoforer udgaar fra Hydro- 

 rhiza, fiestet ved en kort Stilk. De er betydehg større 

 end Hydranthen (2—3 mm. hoie og 1 — 2 mm. lårede i 

 den distale Ende), har sin største Bredde overst og smalner 

 jevnt af mod Stilken. De har 4 Radialkanaler, langs hvis 

 ventrale Vægge Generationsstofferne sees liggende i 4 Par 

 Sække. Individer af begge Kjøn forekommer i samme 

 Koloni. Manubrium rudimentært, uden nogen Mundaabning. 



Denne meget eiendommelige Hydroide, der tidligere 

 er funden forskjellige Steder i Det hvide hav og ved 

 Novaja Semlja, fandte sunder Nordh.-Exp. ved Spitsbergen, 

 i to Kolonier og sammen med H/jdractinia mimda. 



Arten er først beskrevet af Mereschkowsky (84) og 

 senere af Wagner (120), der har gjort den til Gjenstand 

 for indgaaende histologiske Undersøgelser. 



Saadanne har jeg ikke havt Anledning til at foretage, 

 men hvad Koloniens Bygning og Anordningen af Organerne 



Eudendrium rameum. Fallas. 



Trophosome. Hydnicaulus composite, from 7 to 20 

 cm. high; ramitlcation cpiite irregular. Hydranth-bearing 

 branches are simple, with rings at the point of issue, and 

 occasionally elsewhere. The hydranths are large, witli 

 about 20 tentacles. 



Gonosome. J/a/e-gonophores as a rule have 2 cham- 

 bers, and stand radially round non-atrophied hydranths; 

 /e<H«?e-gonophores are pear-shaped, scattered over and below 

 non-atrophied hydranths. 



A specimen of this species is the only representative 

 of the family Endemlridæ that was found during the N. 

 Atlan. Exp. The colony is of the female sex, and about 

 12 cm. high. 



Locality. Station 315. 



Monobrachium parasiticum, Mereschkowsky. 



(Pl. m, fig. 2). 



84, 120. 



, Trophosome. Hydrorhiza forms a thick net-work of 

 anastomosiiig tubes, covered by a chitinous perisarc. Hy- 

 drocaulus rudimentary. Hydranth cylindrical, 1 to 2 mm. 

 high, with one tentacle from 3 to 5 mm. in length, stan- 

 ding a little below the mouth. Near the distal end of the 

 hydranth above the place whence the tentacle issues, there 

 is a ring of stinging cells. 



Gonosome. Medusoid gonophores issue from the 

 hydrorhiza, attached by a short stalk. They are conside- 

 rably larger than the hydranth (2 or 3 mm. high, and 1 

 or 2 mm. broad at the distal end), with their greatest 

 breadth above, and tapering cvenly towards the stem. 

 They have 4 radial canals, along whose ventral walls the 

 generative products are seen lying in 4 pairs of sacs. 

 Persons of both sexes oecur in the same colony. Jlanu- 

 brium rudimentary, without any oral aperture. 



This vei-y characteristic hydroid, which has hithorto 

 been found in various places in the White Sea, and near 

 Novaja Semlja, was found during the N. Atlan. Exp. near 

 Spitzbergen in two culonies, and thogether with Hydrac- 

 tinia mimda. 



The species was first described Ijy Mereschkowsky 

 (84), and subsequently by Wag)ier (120), who has made 

 it the object of careful histological investigations. I have 

 had no opportunity of making such investigations, but the 

 conclusions to which I have come with re^ard to the 



