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.
Langs Tarmspiralen laa et langt fladt, hvidgult
Legeme, som var fæstet til Spiserøret, og som ved nærmere
Undersøgelse viste sig at være Æggestokken, Fig. 6, i, der
indeholdt Æg i forskjellige Udviklingsstadier; i
Kropshul-heden fandtes en Mængde tritsvømmende Æg. Disse vare
flade, skivedannede, ovale meden noget tilspidset Pol, 0.136"""
lange, 0.112mm brede og forsynede med Kimblære og Kimplet;
forresten ligne de Æggene hos Fhascolosoma.
To Segmentalorgan er, der ere frithængende og
brunfarvede, Fig. 6, k.
Nervestrængen løber imellem Rødderne af Retractor
og følger Bugfladen lige til den forreste Ende af Spiserøret,
om hvilket den danner en Ring.
Farven. Kroppen lys gulbrun med lidt mørkere
Tentakler. Skjoldene mørkebrune.
Kun et Exemplar blev fundet paa 87de Station.
Artskarakter.
Kroppen cylindrisk, 8mm lang, bedækket af større og
mindre Chitinplader; den bagerste Ende tværs afskaaren.
Snabelen dobbelt saa lang, som Kroppen, overalt besat med
Hager og forsynet med 10—12 korte Tentakler.
Endeskjoldet rundt, næsten fladt, sammensat af Chitinplader, der
i Randen ere tungeformede, i Centrum runde. Udenom
Skjoldet 6 Ringe, besatte med Plader. Det forreste Skjold
omvendt hjerteformigt.
Af cle hidtil beskrevne Arter af Slægten Aspidosiphon
kommer armatum nærmest den af Dr. Théel1 beskrevne
Asp. mirabilis i men den adskiller sig fra denne derved, at
Snabelen er meget længere og overalt besat med Hager, at
Skjoldene have en noget forskjellig Form, og at
Chitin-pladerne, hvoraf disse ere sammensatte, ere forskjellig ordnede.
Destoværre have vi kun havt l Exemplar til vore
Undersøgelser, der som Følge deraf ikke ere blevne saa
udtømmende, som vi kunde ønske; men se vi hen til de
Beskrivelser, der foreligge over Slægten Aspidosiphcm og
dens Arter, ere vi tilbøielige til at tro, at ogsaa de Forskere,
som tidligere have beskjeftiget sig dermed, have ligesom vi
manglet Materiale; thi ellers vilde sikkerligen Beskrivelserne
have været mere fuldstændige, end de ere.
Stretching along the spiral of the intestine, and attached to
the oesophagus, was seen a flat, whitish-yellow body, which, on
closer inspection, proved to be the ovary, fig. 6, i,
containing ova in various stages of development; and numbers
of isolated ova were found floating in the perivisceral
cavity. The ova of this animal, measuring 0.136""" in
length and 0.112mm in breadth, are flat, discoid, oval, with
a slightly acuminate extremity; they have a germinal vesicle
and a germinal, speck, and for the rest resemble the eggs
of Phasalosoma.
Two free depending segmental organs, brown in colour,
fig. 6, k.
The nervous chord protends between the roots of
the retractor along the ventral surface to the anterior
extremity of the oesophagus, which it annulates.
Colour. — Body light yellowish-brown, with somewhat,
darker tentacles. The shields dark-brown.
One specimen only was brought up, at Station 87
Specific Character.
Body cylindric, 8mm long, covered with chitinous plates
of varying magnitude; posterior extremity truncate.
Proboscis, twice the length of the trunk, studded all over
with chitinous hooks, and furnished with 10 or 12 short
tentacula. Terminal shield round, almost flat, composed of
chitinous plates, which at the margin of the shield are
lingui-form, at the centre round. Round about the shield, 6
annular bands covered with plates. Foremost shield inverted
cordiform.
Of the species belonging to the genus Aspidosiphon
as yet described, Asp. armatum bears the closest resemblance
to Asp. mirabilis, described by Dr. Théel,1 but is distinguished
from it by having a much longer proboscis, studded all over
with chitinous hooks; moreover, the shields in the two
species differ somewhat in form, and the arrangement of the
chitinous plates composing them is different.
Unfortunately, we have had only one specimen on
which to base our observations; and hence they are less
exhaustive than we should have wished them to be; but,
calling to mind the descriptions previously furnished of the
genus Aspidosiphon and its species, the naturalists who have
made these animals the subject of investigation, would,
like ourselves, appear to have lacked sufficient materials;
otherwise their descriptions had certainly approached nearer
to completeness
1 H. Théel. Etudes sur les Gephyriens inerraes. Bihang til Kong1.
Sv. Vet. Acad. Handlingar. 3 Bd. No. <>, Pag. IT.
1 H. Théel. Etudes sur les Gephyriens inermes. Bihang til Kongl.
Sv. Vet. Acad. Handlingar. 3 Bd. No. ti, Pag. 17.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
