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114
Tab. XII, Fig. 5. Et Stykke af Ryghuden med Paxillerne
forstørret, a, Kalknaale.
— 6. En Paxille med sine lange Naale, for-
størret. a, Artikulationsflade.
— 7. En Kalkskede, der omfatter en af de
lange Naale i Paxillen, forstørret, a,
Grunddelen.
— 8. To Arme, seet fra Bugen, forstørret.
a, Ambulacralpigge; b. den store
Kalk-plade i Interbrachialvinkelen; c
Mundpladerne; d, Tænder; e, Pigge i
Rækken imellem Ambulacralfuren og
Armens Rand; /, Randpigge.
— 9. En Ambulacralpig, forstørret, a, den
bredere, krenelerede Ende; b, den
smalere, runde Ende med sin Ledflade; c,
Hulheden.
— 10. En Randpig, forstørret, a, clen runde
Basaldel med sin Ledflade; b, den brede,
frie Ende med sine 5 Takker; c,
Hulheden med sine Længderibber, mellem
hvilke sees Rækker af runde Aabninger.
— 11. Odontophorens ydre Flade, forstørret.
— 12. Den sammes indre Flade, do.
— 13. Odontophoren seet fraoven, do.
— 14. Den indre Flade af Ryggens Hudskelet,
hvori Kalkplader sees.
Tab. XIII, Fig. 1. Hymenaster pdlucidus fra Ryggen,
naturlig Størrelse, a, de 5 Analpaxiller
med deres Membran; b. det første Par
Almpaxiller; c, de ydre Armpaxiller;
d, de indre Armpaxiller.
— 2. Den samme fra Bugen, a, Ambula-
cralpigge; b, Piggen, der hjælper til at
danne Klappen for den
halvmaanefor-mige Aabning; c, den halvmaaneformige
Aabning; d, den lange Kalknaal, der
udspænder Bughuden.
— 3. Et Stykke af en Arm, seet fra Bugen,
forstørret, a, Ambulacralpigge|; b,
Piggen. der hjælper til at danne Klappen
forde halvmaaneformige Aabninger; c,
den halvmaaneformige Aabning; d,
Kalknaal.
— 4. Piggen, der hjælper til at danne oven-
nævnte Klappe, forstørret. a,
Basaldelen med sin konkave Ledflade; b,
Kalkgitter, der vifteformigt omgiver
Basaldelen ; c, Indskjæringerne i Gitterets
5 Spidser.
PI. XII, fig. 5. A portion of the dorsal integument, with
the paxillæ; magnified. a, Calcareous
needles.
— 6. A paxilla, with its long needles; magni-
fied. a, Articulatory surface.
— 7. A calcareous sheath, which encloses one
of the long needles in the paxilla;
magnified. a, The basal part.
— 8. Two rays, actinal aspect; magnified, a,
Ambulacral spines, b, The large
calcareous plate in the interbrachial angle, c,
The oral plates, d, Teeth, e, Spines of
the series between the ambulacral furrow
and the margin of the ray. f, Marginal
spines.
— 9. An ambulacral spine; magnified, a, The
broad arcuate extremity, b, The narrow
round extremity with its articulatory
surface. c, The cavity.
—10. A marginal spine; magnified, a, Round
basal part, with an articulatory surface.
b. The broad free extremity, with its 5
aculeæ. c, The longitudinally ribbed
grooves, with series of round apertures
between.
—11. The exterior surface of the odontophore;
magnified.
—12. The interior surface of the same;
magnified.
—13. The odontophore, viewed from above;
magnified.
— 14. The inner surface of the abactinal dermal
skeleton, in which calcareous plates are
seen.
PI. XIII, fig. 1. Hymenaster péüucidus, abactinal aspect;
natural size, a, The 5 anal paxillæ, with
their membrane, b, The first pair of
brachial paxillæ. c, The outer brachial paxillæ.
d, The inner brachial paxillæ.
— 2. Actinal aspect of the same, a, The amb-
ulacral spines, b, The spine which assists
in forming the flap of the crescent-shaped
aperture, c, The crescent-shaped aperture.
d, The long calcareous needles which
expand the ventral integument.
— 3. Portion of a ray; magnified. Actinal as-
pect. a, The ambulacral spines, b, The
spine which assists in forming the flap of
the crescent-shaped aperture, c, The
crescent-shaped aperture, d, Calcareous needle.
— 4. The spine which assists ’ in forming the
above named flap; magnified, a, The basal
part, with its concave articulatory
surface. b, Calcareous grating, which in fan
shape surrounds the basal part, c, The
incisions in the 5 acuminations of the grating.
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