Farven. 
Rachis smuk teglstensrød. Ntilken lysegul. Polyperne 
blegrøde med bleg-gulrøde Tentakler. 
Findested. 
Station 255. Kun et Exemplar. 
Artskarakter. 
Stokken smal. Rachis lige lang som Stilken. De 
udviklede Cellerækker afvexlende overfor himanden og hvori 
sees dels I Celle, dels 2 Celler paa hver Side, dels 3 paa 
den ene og 2 paa den anden Side samt 1 i Midten at 
Dorsalfladen og endelig 3 paa hver Side. Cellerne ere 
forholdsvis korte, meget vide, næsten bugede i deres øverste 
Parti, og Aabningernes ydre Rand forsynet med 3-5 Tæn- 
der. Dorsalfladen er hvælvet, tæt besat med temmelig store 
Zooider omgivne af en Bundt bleg-rosenrøde Spikler, og 
imellem Zooiderne sees enkelte uudviklede Celler.  Ventral- 
fladen har et nøgent Midtbelte, ved Siden deraf 1—2 Reek- 
ker Zooider. Rachis smuk teglstensrød. Stilken lysegul. 
Polyperne blegrøde med bleg-gulrede ‘Ventakler. 
Protoptilum carinatum, n. sp. 
Tab. ITIL. Fig. 8—11. 
Af denne Søfjær haves kun Rachis, der er 215”” lang; 
dens øverste Ende er blottet for Sarcosoma i en Udstræk- 
ning af 307”. hvor den runde Axe er blottet, Fig. 8. Der 
hvor Sarcosomaet ender, omslutter det Axen i Form 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 Rachis, 
afsnører sig og derved sætter en midlertidig Grændse 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 be- 
røvede sit Sårcosoma paa den omtalte Maade. Det er der- 
for sandsynligt, at den Omstzendighed, at den øverste Ende 
af Rachis i større eller mindre 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 Dorsalflade lober en smal 
men dyb Midtfure bølgeiormigt indtil den øverste Fjerdedel 
af Rachis, Fig. 9. 10, hvor Furen sukcessivt forsvinder og 
Den norske Nordhaysexpedition, Danielssen og Koren: Pennatulida. 
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 is of the 
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 I in the middle of the dorsal surface, 
and, finally, 3 on each side. 
The stalk is narrow. rachis 
length as the stem. 
same 
The cells are relatively short, 
and very wide, they are almost bulging in their superior 
portion, and, the exterior 
furnished with 3—5 teeth. 
margin of the apertures is 
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 beautiful brick-red colour. 
The stem light-yellow. The polyps pale-red, and the ten- 
tacles are pale yellowish-red. 
Protoptilum carinatum, n. sp. 
Pl. IIT. figs. 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 80”; and here, the round 
axis 1s exposed (fig. 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 polyps 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. Inagreat 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, there- 
fore, probable, that the circumstance of the superior 
extremity of the rachis bemg 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, 
but deep and undulating mesial furrow proceeds, up to the 
superior fourth part of the rachis (figs. 9, 10), where the 
Q 
