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8
Fain. Fliistridae.
Gen. Flustra.
Flustra membranaceo-truncata. Smitt.
Smitt (24. Ill), p. 358, 37(5. tali. 20, fig. 1 5.
Findesteder. St. 2(52. 223 (Jan Mayen).
Donne Flustra or tagen paa mange steder i ilen
arktiske 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 fonn karakteriseres som en ægte arktisk Vinstra,
den er saaledes ikke iagttaget ved Storbrittanniens kyst,
og er endnu heller ikke funden ved Island.
Flustra carbasea, Ell. et Sol.
Flastra papyrca. Smitt (34, III), p. 359, 380, tab. 20,
fig. 9 11.
Flastra carbasca. Hincks (8), p. 123, tab. 1(5. fig. 4, 4a;
tab. 14. fig. 1.
Findested. Kjosen (ld 14 favne).
Denne art har ogsaa en stur arktisk udbredelse og
findes desuden ved Storbrittanniens og Danmarks kyster.
Flustra abyssicola. Al. Sars
(i. O. Sars (21), p. 19, tab. 2, fig. 25 30.
Findesteder. St. 149 (Vestfjorden), 2(50
(Porsangerfjorden). 290, 323. 3(13.
Siden G. O. Sars fandt denne eiendommelige
dyb-vandsflustra ved Guldbraildsøerne og Skroven (Vestfjorden)
er den tagen i Gulf of St. Lawrence (Whiteaves) samt i
Karahavet (Smitt).
Det største dyb. hvorfra arten blev hentet op paa
Nordhavsekspeditionen var 475 ni. (St. 3(53. lerhund, temp.
l°.i C.) og det mindste 247 ni. (St. 149, lerbünd, temp.
4°.o C.). Aviculariernes primitive fonn, koloniens rigide
beskaffenhed og forekomsten paa. store dyb tyder paa, at
F. abyssicola er senior blandt de nulevende nordlige
representanter af slegten Flastra.
Kain. Flustridæ.
lien. Flustra.
Flustra membranaceo-truncata, Smitt.
Smitt (24, lill. pp. 358, 37(5; Pl. NX. figs. 1 5.
Occurrence. St. 202, 223 (Jan Mayen).
This Flastra 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
fonn must be characterised as a true arctic Flasfra: it
has, for instance, not been observed on the shores of Great
Britain, nor has it been found in Iceland.
Flustra carbasea. Ell. iV Sol.
Flastra papyrca, Smitt (34. Ill), pp. 359. 380: Pl. XX,
figs. 9—11.
Flustra carbasca. Hincks (8), p. 123; Pl. XVI. figs. 4. 4a;
Pl. 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; Pl. 11. figs 25 30.
Occurrence St. 149 (Vestfjorden), 2(50
(Porsangerfjord), 290, 323, 303.
Since G. O. Sars found this peculiar deep-water
Flustra 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° C.), and the
smallest, 247 m. (St. 149, clay bottom, temp, 4.0" 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 Flastra now in existence.
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