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.
17
Dyrets Bevægelser ere temmelig træge; Fødderne og
Tentaklerne strækkes langt ud og Kroppen ligesom skydes
fremad, idet Legemet snart forlænges, snart forkortes. Under
Forkortningen hvælver Ryggen sig overordentlig meget.
Rygpapillerne kunne ligeledes forkortes og forlænges, uden
egentlig at trækkes ind i Legemet; men naar de vare stærk
sammentrukne, saa man kun Spidserne af dem, og da
skjultes de stundom ganske, idet at Kraven svulmede stærkt op,
og dannede ligesom en Kappe, der dækkede Papillerne.
Kolga ernærer sig væsentlig af Diatomeer og
Fora-miniferer; den sluger den fine Ler, hvori disse Væsener
leve. i overordentlig stor Mængde.
Farren.
Huden er glasagtig gjennemsigtig, hvidagtig, saa at
paa Steder, hvor den er sammentrukken, bliver den
melke-hvid. Tentaklernes o-lappede Blad. især den af Spikler
bebræmmede Del, er intens mørk orangegul. Mundskiven
orangegul med en mørkere, næsten brun Ring om Munden.
Findested.
Station 295. Ståt. 303.
Slægtskarakter.
Legemet bilateralt. Mundskiven, forsynet med 10
Tentakler, vender mod Bugfladen. Anala&bningen paa
Rygsiden. Paa den forreste Del af Ryggen en fremragende
Krave, forsynet med Papiller. Strax foran denne to
Aabninger, 1 for Kjønsorganet og 1 for Stenkanalen. Fødder
paa begge Sider af Kroppen og omkring dennes bagerste
Ende. Kjønnet adskilt. Ingen Tarmappendices (Lunger).
Artskarakter.
Legemet 50"" langt. 15—20"" høit og 12—15""" bredt.
Ryggen stærk hvælvet; paa Kraven 6 paa tvers staaende
Papiller, hvoraf de to midterste ere de længste. 16 lange,
tykke, næsten retraktile Fødder, hvoraf 5 paa hver Side og
6 omkring den bagerste Ende. Kroppens Hud
gjennemsigtig. Tentaklerne 5-lappede. hver Lap 3-fliget.
Førend vi anstille nogle almindelige Betragtninger over
det nu beskrevne Dyr, skulle vi omtale med nogle Ord Dr.
H. Théel’s smukke og i flere Henseender interessante
Arbeide over Slægten Elpidia. Vi gjøre dette saa meget
desto hellere, som vi have havt en god Del Exemplarer af
dette Dyr til vor Raadighed, hvorved vi Skridt for Skridt
ikke alene have kunnet følge hans Observationer; men ogsaa
i det Væsentlige have kunnet constatere deres Rigtighed.
Da Dr. Théel ikke har kunnet disponere over ret mange
Den norske Nordhavsexpedition. Danielssen og Koren: Holothurider.
This seems rather a sluggish species; its movements
are effected by stretching out the suckers and tentacula and
alternately elongating and contracting the trunk, the body
being as it were jerked forward. During each contraction
of the trunk the back is remarkably arched. The dorsal
papill æ also admit of being shortened and lengthened,
without however being strictly retractile; but when contracted
to their full extent, the points only were visible, nay
sometimes no part of the papillae could be discerned, the collar
swelling out and covering them as with a mantle.
Kolga subsists chiefly on Diatomacece and Foratninifera,
by swallowing the soft clay in which these animals are,
embedded in enormous quantities.
Colour.
The skin is glassy, translucent, whitish, — milky-white
when contracted. The tentacular, five-lobed pinnæ, more
especially the part bordered with spiculæ, are of a deep,
vivid orange. The oral disk orange, with a darker, almost
brown ring round the mouth.
Locality.
Stations 295, 303.
Generio Character.
Body bilateral. The oral disk, furnished with 10
tentacula. facing the ventral surface. The anal aperture
on the dorsal surface. On the anterior portion of the back
a papillous, projecting collar. Immediately anterior to the
collar two circular openings, the respective outlets for the
genital organ and the sand-canal. Suckers on both sides
of the trunk and round the terminal extremity. The sexes
separate. No intestinal appendages (respiratory tubes).
Specific Character.
Body averaging 50™" in length, 15m"—20"" in height,
and 12""—15"" in breadth. The back exceedingly arcuate;
the collar furnished with 6 transverse pa])illæ, the middle
pair the longest. Long, thick, almost retractile suckers,
16 in number, 5 on either side, and 6 round the tei-minal
extremity. Skin of the body translucent. The tentacles
five-lobed ; each lobe subdivided into three lobules.
Before proceeding to supplement our description of
this animal with a few general remarks, we will briefly
notice Dr. H. Théel’s elegant and valuable treatise on the
genus Elpidia. We feel indeed specially called upon to do
so, having had the good fortune to obtain a very
considerable number of specimens of the animal in question,
enabling us successively to renew his observations, which in all
essential particulars coincide with our own. Unfortunately,
the number of individuals examined by Dr. Théel was but
3
<< prev. page << föreg. sida << >> nästa sida >> next page >>
