Earn. Flustridae. 



Gen. Flustra. 



Flustra membranaceo-truncata, Smitt. 



Smitt (24, III), p. 358, 376, tab. 20, fig. 1—5. 



Pindesteder. St. 262, 223 (Jan Mayen). 



Denne Flustra er tågen paa mange steder i den ark- 

 tiske zone fra Novaja Semlja til Grønland. Hincks (9) 

 opfører deu ogsaa fra Queen Charlotte Islands. Den er 

 ny for Jan Mayen (st, 223). Efter sin forekomst maa 

 denne form karakteriseres som en ægte arktisk Flustra, 

 den er saaledes ikke iagttaget ved Storbrittanniens kyst, 

 og er en.dnu heller ikke funclen ved Island. 



Flustra carbasea, Ell. et Sol. 



Flustra papyrea, Smitt (34, III), p. 359, 380, tab. 20, 



fig. 9—11. 

 Flustra carhasea, Hincks (8), p. 123, tab. 16, fig. 4, 4a; 



tab. 14, fig. 1. 



Findested. Kjosen (10 — 14 favne). 



Denne art har ogsaa en stor arktisk udbredelse og 

 findes desnden ved Storbrittanniens og Danmarks kyster. 



Flustra abyssicola, M. Sårs 



GL O. Sårs (21), p. 19, tab. 2, fig. 25—30. 



Findesteder. St, 149 (Vestfjorden), 260 (Porsanger- 

 fjorden), 290, 323, 363. 



Siden G. O. Sårs fandt denne eiendommelige dyb- 

 vandsflustra ved Gruldbrandsøerne og Skroven (Vestfjorden) 

 er den tågen i Gulf of St. Lawrence (Whiteaves) samt i 

 Karahavet (Smitt). 



Det største dyb, hvorfra arten blev hentet op paa 

 Nordhavsekspeditionen var 475 m. (St. 363, lerbund, temp. 

 l°.i C.) og det mindste 247 ra. (St. 149, lerbund, temp. 

 4°.fl C). Aviculariernes primitive form, koloniens rigide 

 beskaffenhed og forekomsten paa store dyb tyder paa, at 

 F. abyssicola er senior blandt de nulevende nordlige repre- 

 sentanter af slekten Flustra. 



Fain. Flustridæ. 



Gen. Flustra. 



Flustra membranaceo-truncata, Smitt. 



Smitt (24, III), pp. 358, 376; Pl. XX, figs. 1—5. 



Occurrence. St. 262, 223 (Jan Mayen). 



This Flustra was found in many places in the arctic 

 zone from Novaja Semlja to Greenland. Hincks (9) also 

 mentions it from the Queen Charlotte Islands. It is new 

 to Jan Mayen (St. 223). Judging from its occurrence, this 

 form must be characterised as a true arctic Flustra: it 

 has, for instance, not been observed on the shores of Great 

 Britain, nor has it been found in Iceland. 



Flustra carbasea, Ell. & Sol. 



Flustra papyrea, Smitt (34, I1I) 7 pp. 359, 380; PI. XX, 



figs. 9—11. 

 Flustra carhasea, Hincks (8), p. 123; PL XVI, figs. 4 ; 4a; 



PI. XIV, fig. I. 



Occurrence. Kjosen (10 — 14 fathoms). 



This species also has a wide arctic distribution, and 

 is moreover found on the shores of Great Britain and 

 Denmark. 



Flustra abyssicola, M. Sars. 



G. O. Sars (21), p. 19; PI. II, figs 25—30. 



Occurrence St. 149 (Vestfjorden), 260 (Porsanger- 

 fjord), 290, 323, 363. 



Since Gr. 0. Sars found this peculiar deep-water Flus- 

 tra at the Guldbrand Islands and Skraaven (Vestfjorden), 

 it has been found in the Gulf of St. Lawrence (Whit- 

 eaves) and in the Kara Sea (Smitt). 



The greatest depth from which this species was 

 brought up during the North Atlantic Expedition was 475 

 metres (Station 363, clay bottom, temp. 1.1° 0.), and the 

 smallest, 247 m. (St. 149, clay bottom, temp. 4.9° C). 

 The primitive form of the avicularia, the rigid character 

 of the colony, and its occurrence at great depths, indicate 

 that F. abyssicola is one of the oldest among the northern 

 representatives of the genus Flustra now in existence. 



