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.
Rand forsynede med konisk tilspidsede, runde Pinnuler,
der ere af forskjellig Størrelse og staa uregelmæssigt over
for hverandre. Imellem de store Pinnuler er der sædvanlig
1 liden, stundom 2. Antallet varierer efter Tentakelens
Længde; paa Tentakler, der ere 25—30""" lange, talte
man 24—36 store Pinnuler paa liver Side og omtrent 20
smaa. Øverst paa Tentaklerne kunne flere smaa
Pinnuler staa sammen. Saavel Pinnulerne som Tentakelens
hele aborale og Størstedelen af clen adorale Flade er tæt
besat med yderst smaa Papiller, der mangle paa dennes
nederste Del, som er nøgen og glat, Fig. 20c. Mundskiven
er noget hvælvet mod Centrum, hvor den aflange
Mund-aabning har 8 lancetformige Læber, 1 i hver Mundvig og
3 paa hver Rand, hvilke have en Længdefui’e paa Midten
af deres indre Flade, Tab. IX, Fig. 44.
Axen er firkantet med 4 dybe Furer og 4 afrundede
Kanter; den strækker sig helt igjennem Stokken, hvor den
gjør de samme Bøiuinger, som ere beskrevne under No. I,
dog saaledes, at den yderste, traädforniige Ende synes at
gaa ind i Ventralkaiialen.
Zooiderne indtage ikke alene Rachis men strække
sig nedover den skedeformige Udvidning af Stilken, hvor
de paa Ventralfladen optage især Sidedelene og lader det
midterste Parti være frit, imedens de paa Dorsalfladen sees
overalt, dog temmelig spredt paa den nederste Del, Fig.
20-1. Længere ned paa Stilken blive de end mere spredte
og staa tildels i en Række paa liver Side. Da Zooidernes
Bygning, der er ganske eiendommelig, er den samme paa
alle Exemplarer, skal den senere hen blive omtalt i alle
sine Detailler.
Paa Spiritusexeinplarer er Stilken mere eller mindre
firkantet, idet Coenenchymet er faldt sammen og slutter
sig tæt til den firkantede Axe; men i levende Live, hvor
Coenenchymet es udfyldt af Væsker, og hvor de 4
Længde-kanaler ere udspændte af det i dem cirkulerende Fluidum,
er Stilken rund, naar undtages den nederste, bulbøse Del,
hvor den er lidt fladtrykt mod Ventral- og Dorsalfladen.
Farven er den samme som paa de mindre
Exemplarer, kun træder den intensere frem her. Den nederste,
bulbøse Del er brun, havannafarvet; den øvrige Del af
Stilken er gul og gaar paa den skedeformige Udvidning
over i en meget lys, brun Farve, som paa Rachis er noget
mørkere. Polyperne ere brune. Tentaklerne ere paa den
aborale Flade lidt lysere end Kroppen, imedens den
adorale derimod er næsten kastaniebrun, hvilket ogsaa er
Tilfældet med Mundskiven; men Mundlæberne ere lysere.
Forøvrigt varierer Farven noget hos de forskjellige
Polyper paa samme Stok, hvilket tildels afhænger af
Udviklingsgraden. Paa enkelte Polyper var Mundskiven næsten
kjødrød, og da havde ogsaa Tentaklernes adorale Flade
cylindric, somewhat flattened on the inferior half portion
ot the adoral surface, and, furnished on each margin,
with conical, acciuninate, round pinnules, of varying size,
situated irregularly, opposite to each other. Between the
large pinnules; there is, usually, a small one, and,
occasionally, 2 small ones. The number of these varies,
according to the length of the tentacles. On each side
of such tentacles as measure 25—30""" long, 24—36 long
pinnules, and about 20 small ones, may be counted. On
the superior part of the tentacles, several small pinnules
may be found, situated together. The entire aboral surface;
and the greater part of the adoral surface; of both the
pinnules and the tentacles, are closely beset with extremely
minute papillæ. The lower part of the adoral surface, is,
however, bare, and smooth (Pl. VII, fig. 20c). The oral
disk is somewhat arched towards the centre, at which
point, til© oblong, oral aperture, has 8 lancet-formed
labia;; one, in each oral wall, and, three, on each margin; tin*
latter of which, have a longitudinal furrow in the middle
of their inner surface (Pl. IX, fig. 44).
The axis is quadrangular, with 4 deep grooves, and
4 rounded edges. It extends along the entire stem,
making the same curves as are described under No. 1
specimen; but, in such manner, that the outermost, filiform
extremity, appears to pass into the ventral canal.
The zooids occupy, not only the rachis, but extend
themselves down over the sheath-formed dilation of the
stem, occupying, especially, the lateral parts of the ventral
surface, but leaving the middle part free, whilst, on the
dorsal surface, they are everywhere visible, although rather
dispersed on tin; lower part (Pl. VII, fig. 20"). Further
down the stein, they become still more dispersed, and are
situated, partly, in a series on each side. As the
structure of the zooids is, although quite peculiar, similar in
all the specimens, it will be subsequently described in all
its details.
In specimens preserved in alcohol, the stem is more
or less quadrangular, because the sarcosonia is shrunk
together, and closes tight upon the quadrangular axis;
but, in the living state, when the sarcosonia is filled with
secretions, and when the 4 longitudinal ducts are expanded
by the fluid circulating in them, the stem is round; with
exception of the inferior bulbous part; where, it becomes
a little flattened towards the ventral and dorsal surface.
The colour is the same as in the smaller specimens,
but it appears more intense in this specimen. The
inferior bulbous part, is brown Havana colour; the superior
part of the stem is yellow, but, on the sheath-formed
dilation, it assumes a very light brown colour, which becomes
somewhat darker on the rachis. The polyps are brown.
On the aboral surface, the tentacles are a little lighter in
colour than the body; whilst, the adoral side, on the
contrary, is almost chestnut brown, which, is, also, the case
with the oral disk; but, the oral labiæ are lighter in
colour. The colour varies, however, somewhat, in the various
polyps on the same stalk, being, in a measure, dependent
on the stage of development. In some polyps, the oral
<< prev. page << föreg. sida << >> nästa sida >> next page >>
