129 



meget udviklede. Microsepta ere golde, bære heller ikke 

 Mesenterialfilaraenter. 



Svælgrøret er cylindrisk, ikke meget langt, stærkt 

 foldet paa indre Plade og har en udpræget Svælggrube, 

 Tab. XXIV. Fig. 3/. 



Tentaklerne ere udvendig beklædte med et Epithel. 

 bestaaeude af hoie. cilierende Cylinderceller (Ectodermet), 

 imellem hvilke ei' en stor Rigdora af Nematocyster. Indenfor 

 Ectodermet er et stærkt Lag af Længdemuskler, der støtter 

 sig til et temmelig bredt Bindevævslag, paa hvis indre 

 Væg tindes Cirkulærmuskler, som ere beklædte med cilie- 

 rende Oylinderepithel (Endothelet). der ndfylder en stor 

 Del af Hulheden. 



Findested. 

 Station 14'-'. Nogle Exemplarer. 



Artskarakter. 



Fra det tynde, membi'anøse Coenenchym reise sig 

 tiere Polyper, dels lodret, dels niere horizontalt, hvorved 

 Kolonien faar et grenet Udseende. Polyperne kølleformede, 

 indtil 35""" lange, med en kun 5 — li""" bred Grunddel. Hele 

 Legemet inkrusteret af Sand. Opimod Kroppens øverste 

 Rand sees 16 lancetformede Ribber. Mundskiven flad og 

 fint foldet. Munden næsten rund. Tentaklerne retraktile, 

 sidde i to Rækker, lii i hver. Farven: Den inkrusterede 

 Del af Legemet er graa, spillende lidt i det Grønne. 

 Mundskiven næsten hvid med et rødligt Skjær. Tentak- 

 lerne bleg rosenrøde. 



Epizoanthus glacialis, n. sp. 



T-.A,. VI. Fig. 7—9; Tal.. XXIV, Fig. !>— 8; Tab. XXV. Fig-. 1—:!. 



Coenenchynn t er ikke meget udbredt og sees snart 

 paa flade Stene. snart spundet om tomme Tubularierør 

 eller andre tvinle Gjenstande, Tab. VI, Fig. 7, 8; Tab. 

 XXIV, Fig. 5, 6. Det er temmelig tyndt og tildels saa 

 gjennemsigtigt, at det er let at se, hvorledes det bestaar 

 at' Længdekanaler , der ved Tvergrene kommunicere med 

 hverandre og derved danne et sirligt Netværk. Tal). VI. 

 Fig. 8; Tab. XXIV. Fig. li a. hvorigjennem den ene Polyp 

 kommunicerer med den anden. Polyperne sidde i Regelen 

 isolerede, temmelig langt fra hinanden; selv om der paa 

 en Sten tindes mange Individer, sidde de dog adskilte, idet 

 2 og 3 Polyper hyppigst have deres eget Coenenchym, der 

 ikke korresponderer med de øvrige tilstedeværende Grupper. 



Den norske NordliRvsexpeditinn. I>. ('. Danielssen: Actinida. 



neither the one nor the other kind of muscles are much 

 developed. The microsepta are sterile, and neither do 

 thev carry mesenterial filaments. 



The æsophagus is cvlindrical. nut verv long, and is 

 stronglv folded on the inner surface; it has a distinguished 

 gullet-groove (Pl. XXIV, rig. 3/). 



The tentacles are elad extemallv with an epithelium 

 consisting of high ciliating cylinder-cells (the ectoderm), 

 between which there is a great wealth of nematocysts. On 

 the inside of the ectoderm there is a. strong laver of longi- 

 tudinal muscles. which unite themselves to a rather broad 

 laver of connective-tissue on whose inner wall circular 

 muscles are found. and which is clad with a ciliating 

 cylinder-epithelium (endotbelium) that occupies a grent part 

 of the cavity. 



Habitat. 

 Station Xo. 149. A few specimens. 



Specitic characteristics. 



From the thin membranous sarcosoma several polvps 

 rise up. sometimes vertically erect, sotuetimes more hori- 

 zontally placed, imparting to the colon v a ramificated ap- 

 pearance. The polvps are claviform, measure up to 35""" 

 in length. and have a basal part onlv 5 — H""" in breadth. 

 The entire body is encrusted with sand. Towards the 

 uppermost margin of the body Hi lanceolate ribs are 

 observed. The oral disc is Hat and finely folded. The 

 oral aperture almost circular. The tentacles retractile. 

 situated in two series. l(i in each series. Tlie colour. The 

 encrusted portion of the body is grev with a play of a 

 slightlv greenish colour. The . oral disc is almost white 

 with a reddish tinge. The tentacles pale rosy-red. 



Epizoanthus glacialis. n. sp. 



IM vi. 6gs 7— H; Pl. XXIV. figs. r.— 8; Pl. XXV. figs. l 3. 



The sarcosoma is not widely distributed. and appears 

 sometimes on Sat stones sometimes twined round empty 

 tulies of Tubularia or other thin objects (Pl. VI. figs. 7 — 8; 

 Pl. XXIV, figs, 5, 6). It is rather thin and partly so 

 transparent, that it is easy to observe how it consists of 

 longitudinal ducts, which liv means of transversal branches 

 communicate with each other. and in that manner produce 

 an elegant reticulation (Pl. VI, fig. 8; Pl, XXIV, fig. ti a) 

 through which the one polyp communicates with the other. 

 The polvps are. as a rule. placed singlv, pretty for apart 

 from each other: even if nianv individuals are found upon 

 one stone. they are still seated separately, su that 2 

 and 3 polvps have most frequently their own sarcosoma, 

 which does not correspond with the other groups present 

 on the same spot. 



17 



