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20
Det er heller ikke godt at forstaa, hvorledes
Fordøjelsen og Ernæringen skulde kunne foregaa, med Lethed,
naar hele Tarmens indre Flade var overtrukket med en
Chitinhud, der jo under almindelige Forhold er
uigjennem-trængelig for Vædske, medmindre den var forsynet med en
Mangfoldighed af Porer, og noget saadant omtaler ikke
Prof. Ehlers. Vore Undersøgelser have overbevist os. om,
at Chitinovertrækket ophører ved Spiserørets Begyndelse.
Saavel hos Priapuloides som hos Priapylus have
Mu-skelfibrillerne en skraa Stribning.
Professor Ehlers er den første, der har paavist
Nervesystemet hos Priapidus, og vi have ved vore Iagttagelser
saavel öv’er denne Slægt som over Priapuloides ikke alene
stadfæstet hans Observationer, men ogsaa i histologisk
Henseende fuldstændiggjort dem.
Indeed, it is hard to conceive how the animal could
digest and assimilate its food with facility, were the whole
of the inner surface of the intestine invested with a
chitinous skin, impermeable .as is the latter, under ordinary
conditions, to all fluid substances, unless abundantly furnished
with pores, of which no mention is made by Prof. Ehlers.
Our examination of the new specimens has fully convinced
us, that the chitinous tunic terminates at the origin of
the oesophagus.
The muscular fibrils both in Priapuloides and
Pria-pulus are obliquely’ striate.
Professor Ehlers was the first to show the existence
of a nervous system in Priapulus; and our investigation
alike of this genus and of Priapuloides bears out and,
histologically, completes his observations.
Fam. Konellidæ, Baird.
Hamingia1 arctica, n. g. n. sp.
Tab. IV, V.
Lacaze-Duthiers omfatter kun 2 Slægter henhørende
til denne Familie, nemlig Bondlia, Rolando, og Thalassema,
Cuvier. Den af os nu opstillede 3die Slægt, Hamingia,
have vi troet at maatte henføre til nævnte Familie,
omend-skjøndt den mangler baade Snabel og Børster, der jo ere
angivne som Mærker for Familien. Men som vi senere
skulle paavise, nærmer Hamingia sig i sin Organisation ikke
alene til Thalassema, men i væsentlig Grad ogsaa til
Bo-nellia, saa at vi ikke have kunnet opgive Familieforholdet
til disse, trods de nævnte Mangler.
Bonéllia viridis, dér først er beskrevet af Rolando,
tiltrak sig snart Zoologernes Opmærksomhed ved sine
Besynderligheder baade i Form og Organisation; men
desuagtet hengik omtrent et halvt hundrede Aar, inden dette
mærkelige Dyrs Organisation blev fuldstændig opklaret.
Aarsagen laa hovedsagelig i Vanskeligheden ved at erholde
Dyret levende og i tilstrækkelig Mængde, omendskjønt det
var temmelig almindeligt endog paa ringe Dybde i
Middelhavet og paa de korsikanske Kyster.
Her i Norden er en af os (Koren), den første, der
for omtrent 40 Aar siden fandt Bonéllia viridis ved
Bergen paa en Dybde af 50 Favne, og han paabegyndte
dengang en anatomisk Undersøgelse af den, hvilken han af
Mangel paa fornødent Materiale maatte opgive; thi Bonéllia
viridis er i det Hele taget sjelden ved de norske Kyster,
1 Hamingja, Lykkegudinde i den nordiske Mythologie.
Fam. Bonellidæ, Baird.
Hamingia1 arctica, n. g. n. sp.
Pi. IV, V.
According to Lacaze-Duthiers, 2 genera only are
comprised in the family Bonellidæ, viz. Bonéllia, Rolando,
and Thalassema, Cuvier. The animal representing the new
genus established here, we have seen fit to class under this
family, though wanting in two important characters assigned
to the latter: bristles and a proboscis. Hamingia,
however, as will afterwards appear, not only resembles
Thalassemia in its general organisation, but Bonéllia too, and
closely; wherefore we could not but regard the animal as
a nearly related congener, in spite of defective
characteristics.
Bonéllia viridis, first described by Rolando, soon
drew the attention of zoologists to its numerous
peculiarities of form and organisation; but well nigh half a
century was nevertheless to elapse, ere all questions
pertaining to the economy • of this remarkable animal had
been finally settled. The chief reason of this lay in the
difficulty of obtaining live-specimens in sufficient number,
although the animal is rather common than otherwise in
the Mediterranean, at a trifling depth, and on the coasts
of Corsica.
In Northern Europe, the first who met with an
example of Bonéllia viridis was one of ourselves (Koren),
about 40 years ago, near Bergen, at a depth of 50
fathoms. He commenced an anatomical examination of this
specimen, but had to break it off from lack of materials;
for Bondlia viridis is comparatively rare on the Norwegian
1 Hamingja, the Fortuna of Northern Mythology.
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