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26
imod don skedeformige Udvidning. Denne er 170""" lang,
bliver alt bredere og bredere, dreier sig spiralformigt og
antager en Bredde af 12""", hvor den gaar over i Rachis,
Fig. 23, a. Saavel Ventral- som Dorsalfladen or tæt besat
med Zooider, der blive mere spredte, naar do forlade den
skedeformige Udvidning og ordne sig til en Zooidestrihe
paa hvor Side, hvilken strækkor sig et langt Stykke
nedover Stilken.
Rachis bærer 31 Polyper, er næsten rund, lidt
fladtrykt fra Dorsal- mod Ventralfladen, 26""" bred, 35""" høi
og 80""" i Omkredsen, hvor Polyporne tage deres Udspring,
Fig. 23, b, og har en afrundet, smal Ende, der er 5""" bred
med on fri Rand imod Ventralfladen, Fig. 23, c. Denne
er lidt konvex efter Længden med en svag Pure langs
Midten, meget sinai foroven og overalt ta>t besat mod
Zooider.
Dorsalfladen er lidt konkav paa Midten men noget
hvælvet til Siderne, hvor den gaar over i do lidt
paaskraa-gaaende, laterale Flader; mod disse danner don. om man
vil, et liggende Prisme. Fra Dorsalfladen og de laterale
Flader forlænge sig imellem Polyperne 8 lancetformige
Zooidofelter, Fig. 23, b, d, saa at Rachis kun er fri for
Zooider paa, do Steder, hvor Polyperne udspringe.
Torminalpolypon staar saagodtsom ganske paa den
afrundede Ende af Rachis men tydeligt paa dennes
Dor-salside; don or 15""" lang, 5""" brod og har 22""" lange
Tentakler, Fig. 23,1. Nedenfor, eller bagenfor don, i
omtrent 1""" Afstand, sees en liden, smal Polyp, 8""" lang med
8""" lange Tentakler, og nedenfor denne i samme Linie
staar en større Polyp, 23""" lang, 5""" bred og med Tentakler
af samme Længde som Kroppen. Disse 3 udgjøre do
contra 1-dorsale Polyper. Paa hver Side af do 3
Central-polyper or der 14 Polyper stillode i 3 Rækker, don ene
udenfor den anden. I den inderste Række or der 4
Polyper. hvoraf de fleste ere 15""" lange med lige lange
Tentakler, kun en til Venstre af Endepolypen er blot 5""" lang
med 4""" lange Tentakler; denne Række kan benævnes
dorsal-lateralc Polyper, Fig. 23, 2, 2. Udenfor disse sees
en na’ston halvrund Række paa liver Side, bestaaende af
5 Polyper af lidt forskjellig Størrelse, fra 15—25""" lange
med Tentakler af samme Længde, saaledes at Størrelsen
aftager, jo nærmere de komme Ventralfladen, Fig. 23, 3, 3.
Udenom denne 2den Række or der en 3die, ligeledes
halvrund Række af 5 Polyper, hvis Kroppe ere fra 35—40"""
lange, 10...... tykke; Tentaklerne af Kroppens Lauigdo; ogsaa
her or Forholdet saaledes, at jo niere Polyporne nærme sig
VentralHadoii, jo kortere blive de, Fig. 23, 4, 4, 4. Disse
to ydre Rækker, der dannes af 10 laterale Polyper, omgive
næsten hele Rachis, idet begge Rækker slutte sig sammen
saa at kun Ventralfladen i en Bredde af 6""" er blottet.
Don Polyp, der egentlig binder disse to Rækker sammen
omtrent midt paa Dorsalfladen, er lidt mindre ond de
round, and lias a sarcosoma appearing through it. and is
only 3’"’" broad, up towards the sheafh-fonnod dilation.
This dilation is 170""" long, and becomes broader and broader,
twisting itself spirally; and, at the point whore it passes
over into the rachis, it attains a breadth of 12""" (fig. 23, a).
Both, the ventral and dorsal surfaces, are closely beset
with zooids, which become more dispersed as they leave the
sheath-formed dilation, and arrange themselves in a zooidal
stripe on each side, extending a long way down the
stem.
The rachis carries 31 polyps, and is nearly round;
it is a little flattened from the dorsal towards the ventral
surface; and measures 26"""broad, 35""" high, and 80""" in
circumference, at the point where the polyps have their
origin (fig. 23, b). It has a rounded narrow extremity,
which is 5""" broad, with a free margin towards the
ventral surface (fig. 23, o). This latter, is a little convex,
longitudinally, with a, slight furrow along the middle, very
narrow above, and everywhere, closely beset with zooids.
The dorsal surface is a little concave at the middle, and
somewhat arched, laterally, where it passes into the rather
diagonally sloping lateral surfaces; and it forms with those,
what we may call, a horizontal prism. From the dorsal
surface, and the lateral surfaces, 8 lanceolate zooidal areas
extend themselves between the polyps, (fig. 23. b. d) so
that, the rachis is only devoid of zooids, at. the parts whore
the polyps have their origin.
The terminal polyp is situated, nearly, quito on
Unrounded extremity of the rachis, vet distinctly, on its
dorsal side. It is 15’"’" long. 5""" broad, and it’s tentacles
are 22""" long (fig. 23.1). Below, or behind it, at a,
distance of about 1""", a small narrow polyp is seen, having
a length of 8"""; and, it’s tentacles have, also, a’ length ol’
8"""; and below this polyp, in the same line, a larger polyp
is situated, which is 23""" long, and 5""" broad, with the
tentacles of same length as the body. These three polyps
compose the contro-dorsal polyps. On each side of the 3
central polyps, there are 14 polyps arranged in 3 series,
the one outside the other. In the inmost series, there are
4 polyps, of which, the greater number are- 15""" long,
with tentacles of the same length; one polyp alone, situated
to the left of the terminal polyp, is only 5""" long, with
tentacles 4""" long. This series may be designated
dorsolateral polyps (fig. 23, 2, 2). Outside those, a nearly
semicircular series, consisting of 5 polyps, is observed on
each side. Those are of variable size; from 15—•>h""" long,
with tentacles of the same length; and, arranged in such
manner, that the size diminishes, the closer they approach
to the ventral surface (fig. 23. 3, 3) Outside this second
series there is a third series; also a semicircular Series;
of 5 polyps, whose bodies have a length from of 35—10""",
and a thickness of 10"""; with tentacles same of length as
the body; hero, also, the arrangement is such, that (lie
nearer the polyps approach to the ventral surface, the
shorter do they become (fig. 23, 4. 4. 4). Those two
exterior series; which are formed of lO lateral polyps; sur
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