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69
mindre Masker og frembringe i det Hele et kompaktere
Netværk.
Rundt Analaabningen sees 5 ovale Kalkstykker.
Bugfladens Kalkplader ere aflange, næsten kileformige
og ligge i temmelig regelmæssige Rækker, saaledes at
Siderandene ere skilte fra hverandre, imedens Enderne ere
taglagte, Fig. 14, a; de aftage i Størrelse henimod
Mundvinkelen, hvor de ogsaa ligge noget længere fra hverandre,
Fig. 14, b. De Plader derimod, som støde til
Adambula-cralpladerne, ere mer eller mindre trekantede og noget
kortere end de, som findes paa Midten af
Interbrachial-rummet, og som forene sig med Kalkstykkerne i det næsten
helt forkalkede Septum.
Inderst i Interbrachialrummet sees Odontophoren, der
er temmelig massiv og har to stærke Sideapophyser; dens
forreste Rand er bred og har paa Midten en lidt afrundet
Fremstaaenhed, dens bagerste Del er smal og afrundet,
Fig. 14.
De dorsale Randplader ere ligeledes aflange og stærkt
hvælvede paa»begge Flader, dog mest paa den indre; de
ere størst i Midten af Interbrachiet, hvor de ogsaa staa
noget længere fra hverandre end ud imod Armenes Ende,
Fig. 14, d.
De ventrale Randplader ere ligeledes aflange, men
mere fladtrykte, Fig. 14, e, og bære paa deres ydre Rand
3—6 samlede Pigge; ogsaa disse Randplader ere størst i
Midten af Randen og aftage i Størrelse, alt eftersom de
nærme sig Armens Spids, hvor de støde umiddelbart til
Adambulacralpladerne. Det er disse Plader, som danne
Søstjernens egentlige Rand.
Ambulacralpladerne ere korte og temmelig brede.
Adambulacralpladerne ere store, massive og bære paa
deres underste, afrundede Rand i Regelen 5 Pigge, hvoraf
de 2 have en horizontal Stilling indad mod Bugfuren og
ere de største; de øvrige 3 sidde perpendikulært ved Siden
af hverandre. Paa enkelte Adambulacralplader findes ogsaa
6 Pigge, hvoraf de 4 da sidde udenfor Furen.
Farven.
Rosenrød pna Ryggen, gulrød paa Bugen.
Findested.
Station 10, et Exemplar.
Slægtskarakter.
Legemet 5-straalet med en flad Bug og kun lidet
hvælvet Ryg. Subcentral Anus. Saavel Ryg som Bug
overalt beklædt med fine, isolerede Pigge. Randen skarp,
dannet alene af de ventrale Randplader, der bære Pigge.
frequently lie imbricate than on the disk, they also form
smaller meshes, and altogether, produce a more compact
reticulation.
Around the anal aperture, 5 oval calcareous plates
are observed.
The calcareous plates of the actinal surface are
oblong, and cuneated; and are arranged in rather regular
series in such manner, that the lateral margins are
separated from each other, whilst the extremities lie imbricate
(fig. 14, a). They diminish in size as they approach the
oral angle, in which situation they are also placed more
apart from each other (fig. 14, 6). On the other hand,
the plates abutting upon the adambulacral plates, are more
or less triangular, and are somewhat shorter than those
found in the middle of the interbrachial space and which
unite themselves to the calcareous ossicles in the almost
entirely calcified septum.
The odontophore is found at the inmost point of the
interbrachial space. It is rather massive, and has two
strong lateral apophyses. Its anterior margin is broad,
and has a slightly rounded protuberance in the middle,
whilst the posterior part is narrow and rounded (fig. 14).
The dorso-marginal plates are also oblong, and strongly
arcuate on both surfaces, but most of all upon the inner
surface. They are largest in the middle of the
interbrachial area, and they also, here, stand more apart from each
other, than is the case towards the distal extremity of the
rays (fig. 14, d).
The ventro-marginal plates, are likewise, also oblong,
but more flattened (fig. 14, e), and carry on their exterior
margin 3—6 congregated spines. These plates also, are
largest in the mesial part of the margin, and diminish in
size according as they approach to the distal extremity of
the rays, where they butt immediately to the adambulacral
plates. It is these plates which form the real margin of
the starfish.
The ambulacral plates are short and rather broad.
The adambulacral plates are large and massive, and
they usually carry 5 spines on their inferior rounded
margin, of these, two lie horizontally, in towards the ventral
furrow, and are the largest, whilst the remaining 3 spines
stand vertically alongside of each other. On some
adambulacral plates, 6 spines are also found, in which case, 4
of the spines are situated outside the furrow.
Colour.
The abactinal surface is rose-red, whilst the actinal
surface is orange.
Habitat.
Station No. 10. One specimen.
Generic Character.
The body is 5-rayed, and has a flat actinal surface.
The abactinal surface is only slightly arcuate. The anus
is submesial. Both the abactinal and actinal surfaces are
everywhere clad with slender isolated spines. The margin
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