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Fam. Membraniporidae. 



Gen. Membranipora. 

 Membranipora cornigera, Busk. 



Membranipora flemingii j\ cornigera, Smitt (24, III), p. 367, 



tab. 24, fig. 1. 

 Membranipora cornigera, Hincks (8), p. 164, tab. 21, fig. 



4; tab. 22, fig. 3. 



Findested. St. 290. 



Hincks (8, p. 165) angiver kun tre findesteder for 

 denne art, nemlig Shetland, Outer Haaf, off the coast of 

 Norway. Heraf fremgaar, at arten er yderst sparsom i 

 sin forekomst. Ved de gaffeldelte pigger i mundingen er 

 den saa let kjendelig, at overseen og forveksling ikke godt 

 kan finde sted. 



Membranipora arctica, D'Qrb. 



Membranipora lineata f. sophiae, Smitt (24, III), p. 365, 



tab. 20, fig. 24, 25. 

 Membranipora arctica, Lorenz (16), p. 85, tab. 1, fig. 1. 



Findested. Norskøerne (Spitsbergen). 



Arten dannede et sortagtig overdrag paa snegleskal. 



Membranipora spitsbergensis, Smitt. 



Semi flustr ella arctica, D 7 Orb. (manuscript). 



Membranipora arctica, Smitt (24, III), p. 367, 413, tab. 



20, fig. 33—36. 

 Membranipora spitsberg ensis, Bidenkap (1), p. 619. 



Findested. Norskøerne. 



Denne form. som let kj endes ved sin karakteristiske 

 bagside (Smitt, 1. c., fig. 34) er hidtil kun funden ved 

 Spitsbergen. Membranipora arctica har jeg tåget paa for- 

 skjellige steder i Finmarken, men den er ikke observeret 

 saa langt syd som ved Storbritaniens kyster. 



Fam. Membraniporidæ. 



Gen. Membranipora. 

 Membranipora cornigera, Busk. 



Membranipora flemingii f. cornigera, Smitt (24, III), p. 367 



Pl. XXIV, fig. 1. 

 Membranipora cornigera, Hincks (8), p. 164; Pl. XXI, 



fig. 4; Pl. XXII, fig. 3. 



Occurrence. Station 290. 



Hincks (8, p. 165) mentions only three places where 

 this species has been found, viz. Shetland Isles, Outer 

 Haaf, and off the coast of Norway. From this it appears 

 that the species is of extremely rare occurrence. It is so 

 easily recognisable by the forked spines at the mouth, 

 that it could not well be overlooked or mistaken. 



Membranipora arctica, D'Orb. 



Membranipora lineata, f. sophiæ, Smitt (24, III), p. 365; 



Pl XX, figs. 24 ; 25, 

 Membranipora arctica, Lorenz (16), p. 85; PL I, fig. 1. 



Occurrence. Norwegian islands (Spitsbergen). 



This species formed a blackish coating upon snail- 

 shells. 



Membranipora spitsbergensis, Smitt 



Bemiflustrella arctica, D' Orb. (manuscript). 



Membranipora arctica, Smitt (24, III), pp. 367, 413; PL 



XX, figs. 33—36. 

 Membranipora spitsbergensis, Bidenkap (1), p. 619. 



Occurrence. Norwegian islands. 



This form, which is easily recognised by its charac- 

 teristic back (Smitt, 1. c, fig. 34), has hitherto been found 

 only at Spitsbergen. I have found Membranipora arctica 

 in several places in Finmark, but it has not been observed 

 as far south as the shores of Great Britain. 



Den norske Nordhavsexpedition. O. Nordgaard: Polyzoa. 



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