ARO, QOL, Idi, 
Tab. XIII, 
— 10. 
1892, 1, 
Or 
Et Stykke af Ryghuden med Paxillerne, 
forstørret. a, Kalknaale. 
En Paxille med sine lange Naale, for- 
størret. «a, Artikulationsflade. 
En Kalkskede, der omfatter en af de 
lange Naale 1 Paxillen, forstgrret. a, 
Grunddelen. 
To Arme, seet fra Bugen, forstørret. 
a, Ambulacralpigge; b, den store Kalk- 
plade i Interbrachialvinkelen; c Mund- 
pladerne; d, Tænder; e, Pigge i Ræk- 
ken imellem Ambulacralfuren og Ar- 
mens Rand; f, Randpigge. 
En Ambulacralpig, forstørret. da, den 
bredere, krenelerede Ende; 6, den sma- 
lere, runde Ende med sin Ledflade; c, 
Hulheden. 
En Randpig, forstørret. a, den runde 
Basaldel med sin Ledflade; b, den brede, 
frie Ende med sine 5 Takker; c, Hul- 
heden med sine Længderibber, mellem 
hvilke sees Rækker af runde Aabninger. 
Odontophorens ydre Flade, forstørret. 
Den sammes indre Flade, do. 
Odontophoren seet fraoven, do. 
Den indre Flade af Ryggens Hudskelet, 
hvori Kalkplader sees. 
Hymenaster pellucidus fra Ryggen, na- 
turlig Størrelse. a, de 5 Analpaxiller 
med deres Membran; 0, det første Par 
Armpaxiller; c, de ydre Armpaxiller; 
d, de indre Armpaxiller. 
Den samme fra Bugen. a, Ambula- 
cralpigge; b, Piggen, der hjælper til at 
danne Klappen for den halvmaanefor- 
mige Aabning; c, den halymaaneformige 
Aabning; d, den lange Kalknaal, der 
udspænder Bughuden. 
Et Stykke af en Arm, seet fra Bugen, 
forstørret. a, Ambulacralpigge; b, Pig- 
gen, der hjælper til at danne Klappen 
for de halvmaaneformige Aabninger; c, 
den halvmaaneformige Aabning; d, Kalk- 
naal. 
Piggen, der hjælper til at danne oven- 
nævnte Klappe, forstørret. a, Basal- 
delen med sin konkave Ledflade; 0, 
Kalkgitter, der vifteformigt omgiver Ba- 
saldelen ; c, Indskjæringerne i Gitterets 
5 Spidser. 
LX, fa 
— 10. 
— 13. 
— 14. 
Pl. XIIT, fig. 1. 
ON 
A portion of the dorsal integument, with 
the paxille; magnified. «a, Calcareous 
needles. 
A paxilla, with its long needles; magni- 
fied. a, Articulatory surtace. 
A calcareous sheath, which 
of the long needles in the paxilla; magni- 
fied. a, The basal part. 
Two rays, actinal aspect; magnified. a, 
Ambulacral spines. 0, The large calcar- 
eous 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: jf, Marginal 
spines. 
An ambulacral spine; magnified. a, The 
broad arcuate extremity. 0, The narrow 
round extremity with its articulatory sur- 
face. 
A marginal spine; magnified. a, Round 
basal part, with an articulatory surface. 
ce, The cavity. 
b, The broad free extremity, with its 5 
The longitudinally ribbed 
erooyes, with series of round apertures 
aculeæ. GÅ 
between. 
The exterior surface of the odontophore; 
magnified. 
The interior surface of the same; mag- 
nified. 
The odontophore, viewed from above; 
magnified. 
The inner surface of the abactinal dermal 
skeleton, in which calcareous plates are 
seen. 
Hymenaster pellucidus, abactinal aspect; 
a, The 5 anal paxillæ, with 
their membrane. 0, The first pair of brach- 
ial paxille. c, The outer brachial paxillæ. 
d, The inner brachial paxillæ. 
Actinal aspect of the same. a, The amb- 
ulacral spines. 0b, The spine which assists 
in forming the flap of the crescent-shaped 
aperture. c, The crescent-shaped aperture. 
d, The long calcareous needles which ex- 
pand the ventral integument. 
Portion of a ray; magnified. Actinal as- 
pect. a, The ambulacral spines. 0, The 
spine which assists in forming the flap of 
the crescent-shaped aperture. c, The cre- 
scent-shaped aperture. d, Caleareous needle. 
natural size. 
The spine which assists in forming the 
above named flap; magnified. a, The basal 
part, with its coneave articulatory sur- 
face. 6, Calcareous grating, which in fan 
shape surrounds the basal part. c, The in- 
cisions in the 5 acuminations of the grating. 
encloses one 
