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Farven.
Rachis smuk teglstensrod. Stilken lysegul. Polyperne
blegrøde med bleg-gulrøde Tentakler.
Findested.
Station 255. Kun et Exemplar.
Artskarakter.
Stokken smal. Hachis lige lang som Stilken. l>e
udviklede Cellenekker afvexlende overfor hinanden og hvori
sees dels 1 Celle, dels 2 Celler paa liver Side. dels 3 paa
den ene og 2 paa den anden Side samt 1 i Midten af
DorsalHaden og endelig 3 paa liver Side. Cellerne ere
forholdsvis korte, meget vide. næsten bugede i deres øverste
Parti, og Aabningernes ydre Rand forsynet med 3 5
Tænder. I )orsalfladen er hvad vet, faet besat med temmelig store
Zooider omgivne af en Bundt bleg-rosenrode Spikier, og
imellem Zooiderne sees enkelte uudviklede Celler.
Ventral-fladen har et nøgent Midibelte, ved Siden deraf 1 —2
Rækker Zooider. Rachis smuk teglstensrod. Stilken lysegul.
Polyperne blegrøde med bleg-gulrøde Tentakler.
65
Colour.
The rachis is a beautiful brick-red. The stem is
light-yellow The polyps are pale-red. and the tentacles are
pale yellowish-red.
Habitat.
Station No. 255. Only one specimen.
Specific Character.
The stalk is narrow. The rachis is of the same
length as the stem. The developed cellular series are
situated, alternating, and opposite each other; in them,
there is seen, sometimes, one cell, sometimes, two cells, on
each side; and occasionally, 3 on the one. and 2 on the
other side, besides 1 in the middle of the dorsal surface,
and. finally, 3 on each side. The cells are relatively short,
and very wide, they are almost bulging in their superior
portion, and. the exterior margin of the apertures is
furnished with 3—5 teeth. The dorsal surface is arched,
and closely beset with rather large zooids surrounded by
a bundle of pale rosy-red spicules, and between the zooids
a few undeveloped cells are seen. The ventral surface has
a bare, mesial stripe, alongside of which, there are 1 2
series of zooids. The rachis is a beaut.ful brick-red colour.
The stem light-yellow. The polyps pale-red. and the
tentacles are pale vellowish-red.
Protoptilum carinatum. n. sp.
Tab. 111. Fig. s—11.
Af denne Sø fjær haves kun Rachis. der er 21 ;">""" lang;
dens øverste Ende er blottet for Sarcosoma i en
Udstrækning af 30""". hvor den runde Axe er blottet. Fig. 8. Der
hvor Sarcosomaet ender, omslutter det Axen i Fonn af en
Konus og er uden saavel Celler som Zooider. Det synes
som om Sarcosomaet. efterhaanden som Polyperne af en
eller anden Grund uddø paa den øverste Ende af Bach i s,
afsnører sig og derved sætter en midlertidig Gramdse for
den indtraadte Dødsproces. Paa en hel Del Pennatulider
findes den øverste Ende af Rachis blottet for Sarcosoma;
men i Regelen iagttages dette kun hos ældre Individer; vi
have idetmindste aldrig seet meget unge Pennatulider
berøvede sit Sarcosoma paa den omtalte Maade. Det er
derfor sandsynligt, at den Omstændighed, at den øverste Ende
af Rachis i større eller min Ire Udstrækning blottes for
Sarcosoma og frembyder den nøgne Axe. tyder hen paa en
Dødsmaade, der er særegen for flere Slægter af den store
Pennatulidefamilie.
Langs den noget hvælvede Dorsaltlade lober en smal
men dyb Midtfure bølgeiorniigt indtil den øverste Fjerdedel
af Rachis, Fig. l>. 10. hvor Kuren sukcessivt forsvinder og
Den norske NordlinvsexpiMlitioii. Djinielssen og Koren: l’eiumtiiliiln.
Protoptilum carinatum. u. sp.
pi. nr. tigs. s—11.
We have only the rachis of this sea-pen, and it
measures 215""" in length. It’s superior extremity is devoid
of sarcosoma for an extent of 30"""; and here, the round
axis is exposed (fijjr. 8). At the point where the sarcosoma
terminates, it encloses the axis in the form of a cone, and
is devoid of both, cells and zooids. It seems, as if the
sarcosoma, when the poly]is for some cause or other die
off on the superior extremity of the rachis, cuts itself,
gradually, off by a constrictive process, and thereby places
a temporary limit to the mortal process which has been in
progress. In a great many of the Pennatulidæ, the superior
extremity of the rachis is devoid of sarcosoma, but, as a
rule, this is only observed in the older specimens (We. at
least, have never seen very young Pennatulidæ deprived
of their sarcosoma in the manner referred to). It is,
therefore. probable, that the circumstance of the superior
extremity of the rachis being for a greater or smaller
extent bare of sarcosoma, exposing the uncovered axis;
indicates a mortal process which is peculiar to several
genera of the large family of Pennatulidæ.
Along the somewhat arched dorsal surface, a narrow,
hut deep and undulating mesial furrow proceeds, up to the
superior fourth part of’ the rachis (figs. 9. 10). where the
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