Faiii. Membraniporidae. 



Faui. Membraniporidæ. 



Geil. Membranipora. 

 Membranipora cornigera. Busk. 



MemhrfDupoiri fleiiungii f. oiiiiii/erd. Smitt (■^^4, III), p. 3G7, 



tal), -i-i. tig. 1. 

 Membran/pora conui/era, Hincks (8j, p. 164, tab. 21, fig. 



4: tab. 22, fia,-. 3. 



Pindested. St. 29U. 



Hincks (<S. p. lliS) angiver kun tre findesteder for 

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

 Norway. Heraf fremgaar, at arten er yderst spar.som i 

 sin forekomst. Ved de gaffeldelte pigger i mundingen er 

 den saa let kjendelig, at overseen og forveksling ikke godt 

 kan finde sted. 



Gen. Membranipora. 

 Membranipora cornigera, Busk. 



Memhra)iip(jru tii'iiiiii<iii f. roriiigera, Smitt (24, III), p. 367 



Pl. XXIV. fig. 1. 

 Memhranipora cornigera, Hincks (8), p. 1(14; Pl. XXI, 



fig. 4; Pl. XXn, fig. 3. 



Occurrence. Station 29(1. 



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 e.xtreniely rare occurrence. It is so 

 easily recognisable by the forked spines at the uiouth, 

 that it coukl not well be overlooked or mistakeii. 



Membranipora arctica. DOi-li 



Memhranipora lineafa f. sophiae. Smitt (24. III), p 'M\b. 



tab. 20, fig. 24, 25. 

 Menthranijwra iirdica, Lorenz (161, p. 85, tab. 1. fig. 1. 



Findested. Norskoerne (Spitsbergen). 



Arten dannede et sortagtig overdrag paa snegleskal. 



Membranipora arctica. D'Orb. 



Mi^mbruniporu lineafa, /'. sopJiiic, Smitt (24, III), p. 305; 



Pl XX, figs. 24, 25. 

 Memhranipora arcfiea, Lorenz (16), p. 85; Pl. I, fig. I. 



Occurrence. Norwegian islands (Spitsbergen). 



Tiiis s})ecies formed a blackish coating upon snail- 

 shells. 



Membranipora spitsbergensis. Smitt. 



Semiflusirella arctica. D'Orb. (manuscript). 



Memhranipora arcfiea. Smitt (24, III), p. ;;67, 413, tab. 



20, fig. 33—36. 

 Memhranipora spiti^bergensis, Bidenkap (li, p. 619. 



Findested. Norskøerne. 



Denne form, som let kjendes ved sin karakteristiske 

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

 Spitsbergen. Memhranipora arctica har jeg tåget paa for- 

 skjellige steder i Finmarken, men den er ikke observeret 

 saa langt syd som ved Storbritaniens kyster. 



Membranipora spitsbergensis. Smitt 



Semijtustrella arctica, D'Orb. (manuscript). 



Memhranipora arctica. Smitt (24, III), pp. 367, 413; Pl. 



XX, figs. 33—36. 

 Membranipora !>pitsbergensis, Bidenkap (1), p. 619. 



Occurrence. Xorwegian islands. 



Tiiis fonn, which is easily recognised by its charac- 

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

 only at Snit.sbergen. I have found Memhranipora arctica 

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

 as far south as tiie shores of Great Britain. 



Den norske Xordliavsexpedition. O. Nordgaard: Polyzoa, 



