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24
samme Farve, paa andre var den næsten gul; men hos
samtlige Polyper havde Mundskiveii og Adoralsiden af
Tentaklerne samme Farve.
disk was nearly flesh colour; and when this was so. the
adoral surface of the tentacles, had, also, the same colour.
In others, the colour was almost yellow; hut. in the whole
of the polyps, the oral disk, and the adoral side of the
tentacles, were, uniformly, of the same colour.
No. 6
Tab. VI. Fig. 17. 18. 10. Tail.. VII, Fig. :>•*".
Stilken fra Grunden til Rachis er 470""" lang; den
skedeformige Udvidning er 25""" lang, 6""" bred, hvor den
gaar over i Rachis. Denne er 15""" lang, 13""" bred. Den
øverste Del af Stilken tilligemed Rachis er spiralformigt
dreiet. Dim nederste, bulbøse Del er 80""" lang, smalere
paa Midten (6""" bred) og 8""" bred, baade hvor den opad
begynder at smalne af og mod den nederste Ende, hvor
der er en ovoid Skraaflade, der ender i en Spids, Fig.
22 ". b. Denne Skraaflade findes, som man vil have
bemærket, hos samtlige Exemplarer, narr undtages det
mindste, og det synes, som den bidrager til Stokkens
Befæstning i Lerbunden. Det smaleste Parti af Stilken findes
op imod den skedeformige Udvidning, hvor den er knapt
1»"" bred. Den bulbøse Del er lidt fladtrykt mod
Ventral-og Dorsalfladen : den øvrige Del af Stilken, indtil det Sted,
hvor den skedeformige Vdvidning begynder, er rund og
noget dreiet efter Længden.
Rachis er bægerforniet udvidet til Siderne, bliver
opad noget smalere, uden at det dog er muligt paa Grund
af dens stærke Dreining at paavise. hvorledes den ender.
Dens Ventralflade er konvex og tæt besat med Zooider;
kun paa dens nederste Del iagttages en smal Midtstribe,
som er nogen og glat, og hvor Axen skinner igjennem,
Fig. 17, fl.
Dorsalfladen er nedad lidt konkav, opad hvælver den
sig noget for derefter at blive næsten plan; den udvider sig
stærkt til Siderne, hvorved fremkomme laterale Flader, der
skraane af henimod Ventralfladen. Saavel Dorsalfladen
som de laterale Flader ere tæt besatte med Zooider, der
forhvnge sig i lancetformige Felter imellem Polyperne hen
til Ventral fladen. Ogsaa paa den skedeformige Udvidning
iagttages tætstaaendc Zooider saavel paa Dorsal- som
Ventralfladen, og jo længere de komme ned paa Stilken, jo
mere spredte blive de, ligesom de da ordne sig mere i
Rækker, hvoraf der i Begyndelsen er to, senere en paa
hver Side. Rachis bærer 17 udviklede Polyper, af hvilke
2 ere meget smaa.
Terminalpolypen udspringer just der, hvor
Dorsalfladen ligesom gaar over i Ventralfladen. Kroppen er 12"""
No. 6 specimen.
Pl. VI, ligs. IT IS. 19. PI. VU, fig. 21 ".
The stem is 470""" long, from the base to the rachis;
and the sheath-formed dilation is 25""" long, and (>""" broad,
at the point where it passes over into the rachis. The
latter is 15""" long and 13"’"’ broad. The superior portion
of the stem, and also the rachis, is twisted spirally. The
inferior bulbous part, is 80""" long, and is narrowest :it
the middle, where, it measures 6""" in breadth. At the
point above, where it commences to become narrower, it
measure 8""" in breadth; and it also measures 8"’"’ in breadth,
towards the lower extremity; where, there is an ovate sloping
surface projecting in a point (Pl. VII, fig. 22 ", ’’). This
sloping surface; it will have been remarked; is found in
all the specimens, with exception of the smallest; and it
appears, to contribute in securing the stalk to the clay
bottom. The narrowest part of the stalk occurs, up towards
the sheath-formed dilation, at which point it is barely 1"""
broad. The bulbous portion, is a little flattened towards
the ventral and dorsal surface; but the remainder of the
stem, up to the point where the sheath-formed dilation
begins, is round, and somewhat longitudinally twisted.
The rachis is enlarged laterally, in a chalice fonn.
and becomes, somewhat narrower, upwards; but it is
not possible; on account of its sharp twisting; to detect
where it terminates. It’s Ventral surface is convex, and
closely beset with zooids, and. only, on the inferior part,
may a narrow mesial stripe, be observed; this is bare,
and smooth, and through it. the axis appears visible (Pl. VI,
fig. 17, a).
Below, the dorsal surface is slightly concave; but,
above, it is a little arched; becoming then nearly flat;
then expanding, greatly, to the sides, producing thus, lateral
surfaces which slope off towards the ventral surface. Both
the dorsal surface, and the lateral surfaces are closely
beset with zooids, which prolong themselves to the ventral
surface, in lancet formed areas, between the polyps. On
the sheath-formed dilation, there are, also, observed,
compactly situated zooids, both, on the dorsal and ventral
surface; and the further up the stem that they extend, the
more dispersed do they become; whilst, they also arrange
themselves more in series, of which, there are 2 at the
commencement, and, then, one on each side. The rachis
carries 17 developed polyps; of these, 2 are very small.
The terminal polyp originates, just at the point where
the dorsal surface appears to pass into the ventral surface.
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