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62
tisk Kalilud er anvendt, eller naar Huden indvendig fra
er fjernet.
Ryggens Hudskelet dannes af større og mindre,
forskjelligt formede Kalkplader, Tab. X, Fig. 2, h, der ere
uregelmæssigt taglagte og danne et Net, hvis Masker have
en forskjellig Størrelse, Tab. X, Fig. 2, i. I disse Masker
findes altid en, to eller tre Tentakelporer.
Bugens Hudskelet bestaar af temmelig store, flade
Kalkplader, Tab. X, Fig. 2, g, der ere ordnede i Rækker
saaledes, at enhver af disse danner en liden Bue, der gaar
fra Interbrachialrummets Rand henimod
Adambulacralpla-derne. Inderst i Vinkelen ere Pladerne mindre
regelmæssigt stillede; men saavel disse som de i Rækker ordnede
støde med deres Siderande tæt til hverandre, imedens deres
Ender ere taglagte. De Kalkplader, der støde til
Adarn-bulacralpladerne, ere næsten firkantede; de øvrige ere mere
eller mindre aflange .med tildels tvers afskaarne, tildels
halvmaaneformige Rande, Tab. X, Fig. 2. Inderst i
Bra-chialrummet støder en liden, afrundet Plade til
Odontopho-ren, Tab. X, Fig. 2, d; denne har paa sin smale, ydre
Ende et halvmaaneformigt Indsnif, Tab. X, Fig. 4, a; fra
dens indre Ende, der har en stærk hvælvet Rand, Tab. X,
Fig. 4, b, udgaa to temmelig tykke Apophyser, Tab. X,
Fig. 4, c, og paa dens ydre Flade findes en dyb Fure,
Tab. X, Fig. 4, d,
De dorsale Randplader ere langstrakte, næsten
timeglasformede, og idet de foroven og forneden støde sammen,
dannes paa Midten et Mellemrum, hvori sees en
Tentakelpore, Tab. X, Fig. 2, e.
De ventrale Randplader, Tab. X, Fig. 2, j, der ere
lidt mindre og ikke saa langstrakte som de dorsale, støde
med deres ydre Rand til Dorsalpladerne og med den
indre til Adambulacralpladerne paa Armenes smaleste Del,
men forøvrigt til Hudens Bugplader.
Skelettet frembyder ingen Særegenheder.
Ambula-cralpladerne have temmelig lange, brede Sideprocesser, Tab.
X. Fig. 2, a.
Adambulacralpladerne, Tab. X, Fig. 2, b, ere næsten
firkantede, noget fladtrykte til Siderne og bære paa deres
ydre, frie Flade 6 Pigge, hvoraf de to, der vende indad
mod Bugfuren, ere de længste. Kjæverne ere temmelig
robuste, have paa den ydre Rand 3 Pigge, Tab. X, Fig. l,d,
og bære to lange, stærke Tænder, Tab. X, Fig. 2, c.
Farven.
Ryggen er smuk teglstensrød og Bugen hvid, spillende
lidt i det Gule. Paa Spidsen af Armene et intens rødt
Øie, Tab. XV, Fig. 2.
Findested.
Station 137, et Exemplar. 286, 2 Exempl., hvoraf
then treated with a weak solution of caustic potash, or, when
the integument has been removed from the exterior.
The abactinal dermal skeleton is formed, of larger
and smaller, variously formed calcareous plates (Pl. X, fig.
2, h), which are irregularly imbricate, and form a
reticulation whose meshes are of varying size (Pl. X, fig. 2, i).
In these meshes, 1, 2 or 3 tentacular pores are always
found.
The actinal dermal skeleton consists, of rather large
flat calcareous plates (Pl. X, Fig. 2, g) arranged in rows,
so, that each one of the rows forms a small arc,
extending from the margin of the interbrachial space, close to
the adambulacral plates. At the apex of the angle, the
plates are not so regular in arrangement; but these plates,
as well as those arranged in regular series, are connected
close to each other by their lateral margins, whilst their
extremities lie imbricate. The calcareous plates which
abut upon the adambulacral plates are nearly square. The
remaining plates are more or less oblong, and have, partly,
truncate, partly, crescent-formed margins (Pl. X, fig. 2).
At the inmost point of the interbrachial space, a
small rounded plate abuts upon the odontophore (Pl. X,
fig. 2, d). This plate has a crescent-formed cavity upon
its narrow exterior extremity (Pl. X, fig. 2, a), and from
the inner extremity, which has a strongly arched margin
(Pl. X, fig. 4, b) 2 rather thick apophyses proceed (Pl. X,.
fig. 4, c) and on the exterior surface a deep furrow occurs
(Pl. X, fig. 4, d).
The dorso-marginal plates are elongate, and shaped
somewhat like an hour-glass, and whilst meeting above and
below, they leave an interspace at the middle, in which a
tentacular pore is seen (Pl. X, fig. 2, e).
The ventro-marginal plates (Pl. X, fig. 2, f) are a
little smaller, and not so elongate as the Jdorso-marginal
plates, and, with their exterior margins, abut upon the
dorsal plates, and, with their interior margins, upon the
adambulacral plates of the narrowest part of the ray, and
otherwise, also, on the ventral plates of the integument.
The skeleton presents nothing noteworthy. The
ambulacral plates have pretty long, broad lateral processes (Pl.
X, fig. 2, a).
The adambulacral plates (Pl. X, fig. 2, b) are almost
square, somewhat flattened laterally; and carry 6 spines
upon the free exterior extremity, of which, the 2 spines
that turn inwards towards the ventral furrow, are the
longest. The jaws are rather robust, and have 3 spines
on their outer margin (Pl. X, fig. 1, d), and they carry 2
long, strong teeth (Pl. X, fig. 2, c).
Colour.
The abactinal surface is a beautiful brick-red; whilst,
the actinal surface is white, with a tendency to yellow.
At the tip of the rays, there is seated a deep red eye (Pl.
XV, fig. 2).
Habitat.
Station No. 137. One specimen.
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