Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
89
stændig Art, og forsaavidt har den sin store Interesse.
Sars fandt 1 Exemplar i Vestfinmarken (Øxfjord) paa 100
—150, senere fandt han den igjen ved Christiansund paa
Lerbund paa 40—70 Favne.
Vor Varietet fandtes paa Expeditionen paa følgende
Stationer.
Station 10, nogle Exemplarer. Ståt. 79, et Par
Exemplarer. Ståt. 92, 1 Exemplar. Ståt. 261, 2
Exemplarer. Ståt. 262, 1 Exemplar. Ståt. 290, et Exemplar.
an independent species, and it is in this, that its chief in
terest lies. Sars found one specimen in West Finmark
(Øxfjord), at a depth of 100—150 fathoms. Subsequently,,
he met with it again, at Christiansund, on a clay bottom
at a depth of 40—70 fathoms.
During the expedition, our variety was found at the
following stations:
Station No. 10. A few specimens.
— „ 79. A couple of specimens.
— „ 92. One specimen.
— „ 261. Two specimens.
— „ 262. One specimen.
— „ 290. One specimen.
Bathybiaster pallidus, n. g. et sp.
Tab. XIV, Fig. 1— lft.
1877. Astropeden pallidus, Danielssen & Koren. Nyt
Magazin for Naturvidenskaberne, 23 B. 3 Hefte,
pag. 62, Tab. 3, fig. 1—7.
5 temmelig lange, tilspidsede Arme. Forholdet
imellem den lille og store Radius er paa mindre Exemplarer
af 90—100""" Diameter som 1:4; paa større Exemplarer
af 180mm Diameter som l:43/4; paa de største Exemplarer
af 270mm Diameter som 1: 54/s. Rygfladen er kun lidet
hvælvet, næsten plan paa Armene og overalt tæt besat
med Paxiller, der ere mere eller mindre runde og paa
deres øverste Del forsynede, alt efter deres Størrelse, med
en Samling fra 4—16 større eller mindre, runde Korn,
der hyppigt danne en Roset bestaaende af et Korn i
Midten og 5—6 omkring dette, Fig. 1—3.
Madreporpladen staar nærmere Skivens Rand end
dens Centrum og har paa de største Exemplarer en
granuleret, kun lidet hvælvet Overflade, der paa mindre
Exemplarer er mæandrisk furet og mere hvælvet.
Paa Armene er Paxillarfeltet paa et Exemplar af
170""" Diameter 15ram bredt ved Armens bredeste Del, og
paa Midten af Armen er det 8mm bredt. Paa det største
Exemplar — 270""" — er Paxillarfeltet ved Armens Grund
24mm bredt, imedens det paa dens Midte er 10""" bredt.
Bugfladen er plan med en meget bred
Ambulacral-fure, der har to Rækker tykke, konisk tilspidsede Fødder,
og hvis Rande have et sagtakket Udseende, som
fremkommer derved, at Adambulacralpladernes undre Flade
danner en Vinkel, hvorpaa de imod Furen vendende Pigge,
af hvilke der er 7, staa i en Trekant, saaledes nemlig, at
Den norske Norclhavsexpedition. Dnnielssen ofr Koren. Asteroidea
Bathybiaster pallidus, n. g. et sp.
Pl. XIV, figs. 1—lft.
1877. Astropeden pallidus, Danielssen & Koren. Nyt
Magaz. for Naturvidensk. 23 B. 3 Hefte, pag. 62,
Tab. 3, fig. 1—7.
5 rather large, acuminated rays. In small specimens
of 90 to 100""" in diameter, the proportion between the
disk radius and the brachial radius is, as 1:4; in larger
specimens with a diameter of 180""", the proportion is, as
1:43/.i; and, in the largest specimens, having a diameter
of 270""", the proportion is, as 1:54/5. The abactinal
surface, is almost flat upon the rays, and only slightly arched
upon the disk, and, it is, everywhere, beset closely, with
more or less round paxillæ, whose superior extremity is
furnished, with 4 to 16 larger or smaller round grains,
according to size. These grains frequently form a rosette,
consisting of a central grain, having 5 to 6 other grains
disposed around it (fig. 1—3).
The madreporite is situated nearer to the margin
than to the centre of the diskj; and in the largest
specimens, the superior surface is granulated, and only slightly
convex; but in smaller specimens, it is more convex, and
traversed by meandering furrows.
In a specimen 170""" in diameter, the paxillar area
of the rays is 15""" broad at the broadest part of the ray,
whilst the breadth is 8""" at the middle of the ray. In
the largest specimen 270’"™ in diameter, the paxillar area
at the origin of the fay is 24mm broad, whilst, in the middle
of the ray, it is 10""" broad.
The actinal surface is flat, and has a very wide
am-bulacral furrow, furnished with two series of thick,
coni-cally acuminated suckers, and the furrow margins have a
serrated appearance. This appearance is produced, by the
inferior surface of the adambulacral plates forming an
angle, on which the spines radiating towards the furrow
<< prev. page << föreg. sida << >> nästa sida >> next page >>
