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17
Ventralkanalen, kun dækket af det yderst tynde
Coenen-chym, hvilket dog ikke er Tilfældet. Naar den nærmer
sig Hachis, gjor den en Bøining imod Dorsalfladen for
strax derefter at vende tilbage til Ventralfladen, hvis Midte
den følger lige til Endepolypens Grund; her gjør den atter
en Bøining mod Dorsalfladen for derfra at bøie sig
S-for-migt op imod Ventralfladen, hvor den ender i
Ventralkanalen, Fig. 4. Nedentil ender den i en lille Hage. Axen
er tykkest i den øverste Del af det bulbøse Parti; den er
firkantet med afrundede Kanter og 4 dybe Furer, hvoraf
Ventral- og Dorsalfuren er dybest og dreiet efter
Længden, saa at Furerne ikke danne rfctte Linier. Denne
Dreining tiltager betydeligt op imod og i selve Rachis. Axen
er omgiven af en tyk, membranøs Skede, hvorpaa de 4
Septa fæste sig.
into the ventral duct itself; covered, only, by the extremely
thin sarcosoma; this is, however, not the case. As it
approaches the rachis, it curves towards the dorsal surface,
turning, immediately afterwards, back to the ventral
surface, and following along its mesial line, right to the base
of the terminal polyp. It, here, forms another curve
towards the dorsal surface, and thence, curves in form of
an S, up towards the ventral surface; where, it terminates
in the ventral canal (fig. 4). It terminates beneath, in a
small hook. The axis is thickest in the superior part of
the bulbous portion; it is quadrangular, with rounded
edges, and has four deep grooves; of which, the ventral and
dorsal grooves are the deepest, and are longitudinally twisted;
so that the furrows do not form straight lines. This
twisting increases, considerably, up towards, and also, in the
rachis itself. The axis is surrounded by a thick
membranous sheath, upon which, the four septa are secured.
No. 2.
Tab. V, Fig. 5. fi, 7.
Stilken er temmelig opretstaaende, dens hele Længde
fra den nederste Ende til Hachis er 150""" lang; den er
lidt vreden efter Længden, overtrukken med Slim, og dens
øverste Halvdel er næsten rund, imedens den nederste,
bulbøse Del, som er 48""" lang, 4—5’"’" bred, er noget
indkneben paa Midten, lidt fladtrykt paa Ventral- og
Dorsalfladen og ender i en ovoidformet Skraaflade, der løber ud
i en Spids, Fig. 5, a. Stilken aftager i Tykkelse
successivt op imod den øverste, udvidede Del, hvor den kun er
1""" tyk. Den skedeformige Udvidning er 7""" lang men
meget smal; kun der, hvor den gaar over i Hachis,
indtager den en Bredde af henved 2"’"’.
Rachis er noget dreiet til Siden, temmelig opsvulmet,
10’""’ lang, paa Midten omtr. 6""" bred og ender lidt
afstumpet, Fig. 5. 7; den bærer 7 udviklede Polyper og 1
embryonal. Ventralfladen er konvex, har en Sidedreining,
er bred og forstørstedelen besat med Zooider, — kun paa
dens nederste Halvdel sees en Midtlinie, hvor Axen, der
er nøgen, skinner gjennem, Fig. 7, a. Dorsalfladen
eismal, lidt konkav, dreiet til Siden og overalt besat med
Zooider, der over Ventralfladens Sider danner
lancetfor-niede Felter imellem Polyperne, saa at egentlig hele Rachis
er tæt besat med Zooider, naar undtages den før omtalte
nøgne Stribe paa Ventralfladen, Fig. 6, a. Sidefladerne,
eller maaske rettere Siderandene, ere yderst smale og danne
Grændsen imellem Dorsal- og Ventralfladen.
Terminalpolypen sidder lige i Enden af Rachis, og
ved første Øiekast ser det ud, som om den udsprang fra
l)en norske Nordliavsexpedition. Danielssen og Koren: Pennatulida.
No. 2 specimen.
Pl. V, figs. f>. 0. 7.
The stem is tolerably vertical, and its whole length,
from the inferior extremity to the rachis, is 150""". It is
slightly twisted longitudinally, and is enveloped by mucous;
the superior half portion is almost round; whilst the
inferior bulbous portion; which is 48"’"’ long, and 4—5"""
broad; is somewhat constricted at the middle, slightly
flattened, on the ventral and dorsal surfaces; and terminates
in an ovate, sloping surface, which projects in a point (fig.
5, a). The stem diminishes gradually in thickness, up
towards the superior dilated part; at which point, it is
only 1""" thick. The sheath-formed dilation is 7’"’" long,
but very narrow; only attaining a breadth of about 2’""’,
at the point where it passes over into the rachis.
The rachis is somewhat laterally twisted, and is
considerably swollen. It is 10’""’ long, and about 6""" broad
at the middle; and its termination is somewhat
truncated (figs. 5. 7). It carries seven fully developed polyps,
and one embryonal polyp. The ventral surface is convex,
and has a lateral twist; it is broad, and for the greater
part, is beset with zooids. Only on the inferior half
portion, is a mesial line observed; where the axis; which
is bare; becomes visible, (fig. 7, a). The dorsal surface is
narrow, and somewhat concave, it is twisted laterally, and
is everywhere beset with zooids; which, on the margins
of the ventral surface, form lancet-formed areas between
the polyps; so that, in reality, the entire rachis is closely
beset with zooids; with exception, of the bare stripe on
the ventral surface previously spoken of (fig. 6, a). The
lateral surfaces, or perhaps more correctly, the lateral
margins, are extremely narrow, and form the border
between the dorsal and ventral surfaces.
The terminal polyp is situated exactly at the
extremity of the rachis; and at first sight, appears, as if it pro-
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