tisk Kalilud er anvendt, eller naar Huden indvendig fra 
er fjernet. 
Ryggens Hudskelet dannes af større og mindre, for- 
skjelligt formede Kalkplader, Tab. X, Fig. 2, h, der ere 
uregelmæssigt taglagte og danne et Net, hvis Masker have 
en forskjellig Størrelse, Tab. X, Fig. 2,7. I disse Masker 
findes altid en, to eller tre Tentakelporer. 
Bugens Hudskelet bestaar af temmelig store, flade Kalk- 
plader, Tab. X, Fig. 2, g, der ere ordnede i Rækker saa- 
ledes, at enhver af disse danner en liden Bue, der gaar 
fra Interbrachialrummets Rand henimod Adambulacralpla- 
derne. Inderst i Vinkelen ere Pladerne mindre regelmæs- 
sigt 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 Adam- 
bulaeralpladerne, ere næsten firkantedef; 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 Indsnit, 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, 
ald, 2, Jes 4, as, 
De dorsale Randplader ere langstrakte, næsten time- 
glasformede, og idet. de foroven og forneden støde sammen, 
dannes paa Midten et Mellemrum, hvori sees en Tentakel- 
pore, Tab. X, Fig. 2, e. 
De ventrale Randplader, Tab. X, Fig. 2, f, der ere 
lidt mindre og ikke saa langstrakte som de dorsale, støde 
med deres ydre Rand til Dorsalpladerne og med den in- 
dre til Adambulaeralpladerne paa Armenes smaleste Del, 
men forøvrigt til Hudens Bugplader. 
Skelettet frembyder ingen Særegenheder. ~ Ambula- 
eralpladerne have temmelig lange, brede Sideprocesser, Tab. 
DX Idi Å Ge 
Adambulacralpladerne, Tab. X, Fig. 2,0, 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 ro- 
buste, have paa den ydre Rand 3 Pigge, Tab. X, Fig. 1,d, 
og bære to lange, stærke Tender, 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. 
v 
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 reticul- 
ation whose meshes are of varying size (Pl. X, fig. 2, 2). 
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 are, extend- 
ing 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 imterbrachial space, a 
small rounded plate abuts upon the odontophore (PI. axe 
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,¢) 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 fdorso-marginal 
plates, and, with their exterior margins, abut upon the 
dorsal plates, and, with thei 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 amb- 
ulacral plates have pretty long, broad lateral processes (PI. 
XG fig 2500): . 
The adambulacral plates (Pl. X, fig. 2,0) 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, 0). 
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. 
Habitat. 
Station No. 137. One specimen. 
& 
