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.
94
vexillifer1. Det har imidlertid ikke været os muligt
hverken af den korte Beskrivelse eller af den denne
ledsagende Tegning at identificere dem.
Ved at sammenholde Thomsons Karakteristik med
den af os leverede Beskrivelse ville Forskjellighederne
bedst kunne vurderes. Kun skulle vi bemærke, at efterat
Viguier har erklæret Thomsons Archaster vexillifer for at
være en Astropecten, kommer den vor meget nærmere.
Ogsaa vi antog vor Søstjerne i en tidligere Afhandling2 for
en Astropecten; men senere Undersøgelser har vist, at den
baade ved de høist mærkelige Pedicellarier og
Skeletbygningen adskiller sig saa meget fra Slægten Astropecten, at
vi have fundet det nødvendigt at danne en ny Slægt
folden, hvilken vi have benævt Batliybiaster.
Slægtskarakter.
Legemet fladt, 5-armet med overordentlig bred
Ambula-cralfure, paa hvis Rand findes lange, stilkede, eiendommelige
Pedicellarier. Interbrach i alrummet bredt, tæt besat med
siddende Pedicellarier. Rygsiden beklædt med Paxiller;
dens Skive ligesom Armenes Midtparti uden
Tentakelporer. Ryggens Hudskelet dannes paa Skiven og Armenes
Midtparti af runde, tæt taglagte Kalkplader; paa
Armenes Sidedele af stjern efor mige. taglagte Plader. Ingen
Anus.
Artskarakter.
Forholdet imellem den lille og store Radius som 1 :
43/4 (Størrelse 170""" Diameter). 1 :54/ß (Størrelse 270°""
Diameter). Randpladerne, 05—70, staa perpendikulært
ligeoverfor hverandre, ere flade, overalt dækkede af
taglagte Kalkskjæl. Paa de dorsale Randplader en udpræget,
fladtrykt Torn. De ventrale Randplader bære fra 1—4
Torne. Saavel de dorsale som ventrale Randpladers
Rande enkelt sagtakkede. Paa Midtpiggen af de
trekantede Adambulacralplader, der begrændse Ambulacralfuren.
en eiendommelig, stilket Pedicellarie. I
Interbrachialrum-mene regelmæssige Rækker af siddende Pedicellarier.
Farven bleggul.
Luidia Sarsii, Düben & Koren.
1835. Asterias, n. sp., M. Sars. Beskrivelser og
Iagttagelser over Dyr ved den Bergenske Kyst, pag. 39.
’ Wyville Thomson. The depths of the sea; pag. 150, fig. 25.
2 Nyt Magazin for Naturvidenskaberne, 23 B. 3 H., pag. 02,
Tab. 3, fig. 1—7.
Jer1 described by Wyville Thomson. Neither, from his
short description, nor. the accompanying illustration,
however, has it been possible for us to quite identify them.
By comparing Thomson’s distinguishing features with
the description we have given, the divergencies can best
be appreciated. We would remark, however, that although
Viguier has declared Thomson’s Archaster vexillifer to be
an Astropecten, it approaches much nearer to ours.
In an earlier memoir2, we. also, supposed our starfish
to be an Astropecten, but subsequent examinations have
shown, that both in its highly remarkable pedicellariæ, and
also, in the skeleton arrangement, it differs so much from
the genus Astropecten, that we have considered it necessary
to form a new genus for it, and have designated it
Bath-ybi aster.
Generic Character.
The body flat. 5-rayed, with an extremely wide
amb-ulacral furrow, having long, pedunculated, peculiar pedicellariæ
along its margins. The interbrachial space broad, and
closely beset with sessile pedicellariæ. The abactinal surface
clad with paxillæ. The disk, and also the mesial part of
the rays, free of tentacular pores. On the disk, and
mesial part ol the rays, the dorsal dermal skeleton is formed,
of round, closely imbricate, calcareous plates, and on the
lateral margins of the rays, it is formed of asteriated
imbricate plates. No anus.
Specific character.
The proportion between the disk radius and the
brachial radius is. as 1 : 4s/4 (the diameter of the starfish
being 170mm). The proportion is, as 1 : 54/5, in a specimen
270mm jn diameter. The marginal plates are 65 to 70 in
number, and placed vertically, right opposite each other.
They are flat, and, everywhere, covered by imbricate scales.
On the dorso-marginal plates, prominent, flattened aculeæ
visible. The ventro-marginal plates carry 1—4 aculeæ.
Of the dorso-marginal and ventro-marginal plates, occasional
ones, are serrated. On the mesial spine of the trilateral
adambulacral plates bordering [the ambulacral furrow, there
occurs, a peculiar pedunculated pedicellaria. In the
interbrachial spaces, regularly formed series of sessile pedicellariæ.
Colour pale yellow.
Luidia Sarsii, Diiben & Koren.
1835. Asterias. n. sp., M. Sars. Beskrivelser og
Iagttagelser over Dyr ved den Bergenske Kyst pag. 39.
1 Wyville Thomson. The depths of the sea, pag. 150, fig. 25.
2 Nyt Magazin for Naturvidenskaberne, 23 B. 3 H., pag. 62,
Tab. 3, fig. 1—7.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
