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4
Svava1 glacialis, n. g. et sp.
Tab. I, fig. l.
Stokken stiv, tynd, rund, 90""" lang (det storste
Exemplar). Rachis 56""" lang; i dens øverste Ende viser
Axen sig blottet for Sarcosoma i 3’"m Længde.
Ventralfladen lidt hvælvet, glat, forsynet med en
temmelig bred Midtfure, Fig. 2, og paa hver Side af denne
Antydninger til Ventral vulster.
Dorsalfladen hvælvet, har en smal Midtfure; paa hver
Side af denne en Række afvexlende, yderst smaa, næsten
stilkede Finner, der hver bære i Regelen 4 Polyper, Fig.
L. 3; paa den øverste Del af Rachis sees dels 3, dels 2
Polyper i hver Finne, Fig. 1.
Cellerne ere cylindriske, glatte, 2""" lange og stillede
lidt paatvers nedenfra opad, fra Dorsal- imod
Ventralfladen, Fig. 1. 3. Deres nedre, lidt smalere Del er paa de
to Hjørnecellers indre Flade sanimenvoxet med de to
mellemste. Celler, hvorved den rudimentære Finne dannes,
Fig. 5; de to Hjørnecellers ydre Flade er fri. Cellernes
øverste Rand er forsynet med 8 smaa, bløde Papiller, Fig.
5, a, der næsten ganske udslettes, naar Celleaabningen er
udvidet, hvorved Randen faar et undulerende Udseende,
Fig. 5. 6, a. Naar Cellen er lukket, Polypen indtrukken,
har den dels en ovoid, dels en elliptisk Fonn. Paa
enkelte Finner sees 3 Celler at være sammenhængende,
imedens den 4de er saagodtsom fri, kun fæstet til Finnen
ved en smal Forlængelse af Cellens nederste Del.
Polypkroppen er cylindrisk, glat, omtrent 2""" lang,
men udvider sig traktformigt mod Tentakelskiven, Fig. 6;
denne er noget hvælvet og har i Midten en lidt aflang
Mund-aabning. Tentaklerne ere tykke, lige saa lange som Kroppen,
og som sædvanligt forsynede med Cirrer. Nedenfor hver
Finne sees i en lidt paatversgaaende Række 4 yderst smaa,
runde Zooider, Fig. 3. 4, a. 5, &; har Finnen kun 2 eller
3 Polyper, retter Zooidernes Antal sig derefter.
Paa hver Side af Rachis’s Dorsalfure er der paa det
største Exemplar 16 Finner, der bære fuldt udviklede
Polyper; nedenfor disse komme 12, næsten paatversgaaende,
listeformige Finner med 4, 3 og 2 uudviklede Polyper, og
endelig sees en enkelt Række af smaa, runde Zooider, Fig.
I, der strækker sig langt nedover Stilken.
Stilken er 34mm lang, rund; hvor Zooiderækken tager
sin Begyndelse er den temmelig smal men udvider sig
Svava1 glacialis, n. g. et sp.
Pi. I, tig. i.
The stalk is erect, thin, and round, and measures
(the largest specimen) 90""" in length. The rachis
measures 56mm in length. For a length of 3""", the superior
extremity of the axis is devoid of sarcosoma.
The ventral surface is somewhat arched, and smooth,
and is furnished with a rather broad mesial furrow, (fig. 2)
on each side of which, there are indications of ventral
prominences.
The dorsal surface is arched, and has a narrow
mesial furrow; and on each side of this, a series of
alternating, extremely minute, almost pedunculated fins; each of
which carries, usually, four polyps (figs. 1, 3). On the
superior part of the rachis, sometimes 3, sometimes 2 polyps,
are seen on each fin (fig. 1).
The cells are cylindrical, and smooth, and measure 2"""
in length; they are placed a little diagonally, from
downwards to upwards from the dorsal towards the ventral
surface (figs 1. 3). Their lower somewhat narrower part,
is, at the inner surface of the two corner cells, concreted
with the two middle cells; and the rudimentary fin is
thereby formed (fig. 5). The outer surface of the two
corner cells is free. The upper margin of the cells is
furnished with, 8 small, soft, papillæ, (fig. 5, a) which
are almost entirely obliterated when the aperture of the
cell is dilated, and the margin obtains, thus, a wavy
appearance (fig. 5. 6, a). When the cell is closed and the
polyp retracted, it has, partly, an ovate, and, partly, an
elliptic form. In a few fins, 3 cells are seen to be
attached to each other, whilst the fourth is very nearly
detached; in as much, that it is only attached to the fin
by a narrow prolongation of the inferior part of the cell.
The body of the polyp is cylindrical, and smooth;
and about 2mm long, but it becomes dilated in a
funnel-shape, towards the tentacular disk (fig. 6). The latter is
a little arched, and in the middle, has a somewhat oblong
oral aperture. The tentacles are thick, and of uniform
length with the body, and, as usual, are furnished with
pin-nulæ. Below each fin, and placed in a somewhat transversal
series; 4 extremely small, round, zooids are observed (figs.
3. 4, a. 5, b). If the fin is only furnished with 2, or 3
polyps, the number of the zooids is in proportion thereto.
In the largest specimens; there are 16 fins, situated
on each side of the dorsal furrow of the rachis, [-carrying]-] {+carry-
ing]+} fully developed polyps; below these again, are, 12
nearly transverse fillet-formed fins, with 4, 3 and 2
undeveloped polyps; and finally, a single series of small round
zooids is seen, (fig. 1) which extend far down the stem.
The stem is 34mm long, and is round. At the point
where the zooidal series commences, it is rather narrow;
Svava, on Valkyrie.
Svava = A valkyrie (a battle nymph).
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