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41
Madreporpladen lidt aflang, sidder strax bortenfor
Analaabningen, Fig. 11.
Armene ere temmelig runde, omtrent 2mm brede ved
Grunden. Piggene ere ordnede paa samme Vis som paa
Skiven, men Maskerne ere mere regelmæssige og danne,
især til Siderne, Længderækker. I enhver Maske sees
nedsænket en Tentakelpore. Paa hele Armens Ryg, ligefra
Skiven og ud til Spidsen, sees disse Rækker af
Tentakelporer, Fig. 12.
Armenes Rand har to Rækker Pigge, en der tilhører
Ryggen, en Bugen. De dorsale Randpigge ere stumpe og
korte, Fig. 12. De ventrale ere længere, mere tilspidsede
end de dorsale og staa lige over for disse, Fig. 13.
Bugen flad. Ambulacralfuren smal, forsynet med 2
Rækker cylindriske Fødder uden Spikier og 3 Rækker
takkede Pigge, hvoraf de i den inderste Række ere de
længste og indtage Furens halve Bredde, Fig. 13.
Imellem den yderste Række Ambulacralpigge’ og de ventrale
Randpigge sees paa den inderste Del af Armen en Række
stumpe Pigge, Fig. 13, a. Interbrachialrummet er smalt
og besat med stumpe Pigge, der synes at danne et Par
Tverrækker, Fig. 13, b.
Mundpladerne have paa deres indre, afrundede Rand
2 stærke Tænder, Fig. 13, c, og paa Siderandene 3 lange
Takker, Fig. 13, d, der gribe saaledes ind i hverandre, at
Munden ganske lukkes, Fig. 13.
Ryggens Hudskelet bestaar af et Kalknet med meget
vide Masker, der dannes ved, at smaa, lidt aflange, smale
Kalkplader lægge sig paa hverandres Ende, Fig. 14, a,
hvorved længere Bjelker fremkomme, som da forene sig og
danne Nettet, Fig. 14. Paa den ydre, lidt hvælvede Flade
af de smaa Kalkplader er en yderst liden Knop, hvortil
en Pig er fæstet, Fig. 14, b.
Farven gulrød.
Pindested.
Station 195. Et Exemplar.
The madreporite is somewhat oblong, and is situated
immediately, without, the anal aperture (Pl. VI, fig. 11).
The rays are rather round, and are about 2""" thick
at their origin. Their spines are arranged in the same
manner as on the disk, but the meshes are more regular,
and, especially on the lateral surfaces of the rays, form
longitudinal series. An embedded tentacular pore is
visible in each mesh. These series of tentacular pores are
visible on the entire abactinal surface, right from the disk
to the distal extremity (Pl. VII, fig. 12).
The margin of the rays has two series of spines, of
which, one pertains to the abactinal surface and the other
to the actinal surface. The dorso-marginal spines are
short and blunt (Pl. VII, fig. 12). The ventro-marginal
spines are longer, and more acuminate than the dorsal
spines, and are placed right opposite to these (Pl. VII,
fig. 13).
The actinal surface is flat; and the ambulacral furrow
is narrow, and furnished with two series of cylindrical
suckers free’from spiculæ; and, also, with three series of
aculeated spines, of which, those in the inmost series are
the longest, and include half the width of the furrow (PI.
VII, fig. 13).
Between the exterior series of ambulacral spines and
the ventro-marginal spines, a series of blunted spines is
visible on the diskal part of the ray (Pl. VII, fig. 13, a).
The interbrachial space is narrow, and beset with blunted
spines, which appear to form a couple of transverse series
(Pl. VII, fig. 13, 6).
The oral plates have 2 strong teeth situated on the
interior of their rounded margin (Pl. VII, fig. 13, c), ^,nd
upon the lateral margins, they have 3 long aculeæ (Pl. VII,
fig. 13, d), and these so interlace with each other, that
they permit the. mouth to close completely to (Pl. VII,
fig." 13).
The abactinal dermal skeleton consists, of a calcareous
reticulation having very wide meshes, produced by small,
somewhat oblong, narrow, calcareous plates, laminating on
the extremities of each other (Pl. VII, fig. 14, a);
thereby producing longish rods, which unite, and form the
reticulation (Pl. VII, fig. 14). On the somewhat arcuated,
exterior surface of the small calcareous plates, an
extremely small knob occurs, to which there is secured a
spine (Pl. VII, fig. 14, b).
The colour is orange.
Habitat.
Station No. 195. One specimen.
Den norske Nordhavsexpedition. Danielssen og Koren: Asteroiden.
10
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