og staa ved de brede Grunddele saa vidt fra hverandre, 
at Interbrachialrummene danne en stump Vinkel. Saavel 
Skivens som Armenes Rygtflade er besat med Paxiller, der 
ere korte, cylindriske, næsten tvers afskaarne, bærende 
mange Kalknaale. Disse Paxiller staa temmelig vidt fra 
hverandre, ere uregelmæssigt stillede paa Skiven, imedens 
de paa Armene danne mere eller mindre regelmæssige Rækker. 
Over hele Skivens Ryg findes i hvert Paxillarfelt S— 
10 cylindriske Respirationsrør, der som oftest sidde omkring 
Paxillerne. Paa Armene ere de endnu langt sparsommere, 
kun 1—2, hoist 3 ved Grunden af hver Paxille. 
Paa hver Siderand af Armene, nærmest Bugfladen, 
staar en Række 12-—13 store, fremragende Paxiller, der 
have et fladtrykt Skatt og paa Enden en stor Samling af 
Kalknaale, Tab. IX, fig. 9. 
Madreporpladen, der er lidt aflang, findes imellem 
Skivens Centrum og en af Armvinklerne, dog nærmere 
denne. 
Bugen er flad med brede Interbrachialrum, der ere 
tæt besatte med større og mindre Paxiller, og langs Am- 
bulacralfuren findes paa hver Side en Række Kalkpigge, 
der udgaa fra den indre Del af Ambulacralpladernes undre 
Rand. Af disse Kalkpigge er der 6—7 1 Antal, hvilke 
ved Grunden ere sammenbundne ved en fibrøs Membran, 
men artikulere med Adambulacralpladen, Tab. I X, Fig. 14, a. 
De ere stillede paa langs og bueformigt, saa at de 
midterste ere de længste, og naar de bevæges mod Bugfu- 
ren, støde de sammen med de tilsvarende fra den anden 
Side, saaledes, at de gribe i hverandre og derved ganske 
dække Bugfuren. Foruden disse Kalkpigge, der staa paa- 
langs af Bugfuren, udgaa der fra dennes ydre Rand Tver- 
rækker af Kalkpigge, der tage deres Udspring fra den ydre 
Del af Adambulacralpladernes undre Rand, med hvilken 
de artikulere, Tab. IX, Fig. 14. b. 
Hver Tverrække har især paa Midten af Armen 8— 
10 Kalkpigge, der i Almindelighed ere lige lange, Tab. IX, 
Fig. 14. 
Ryggens Hudskelet bestaar af smaa, aflange Kalk- 
stykker, der lægge sig sammen og danne kortere og læn- 
gere Kalkstykker, som anastomosere med hverandre, hvor- 
ved et Netværk fremkommer med temmelig vide Masker, 
dog langtfra saa vide, som hos Solaster papposus. Kalk- 
nettet er nemlig hos Solast. affinis bygget baade tættere 
og finere end hos S. papposus. I Maskerne ere dels en- 
kelte, dels flere Kalkkorn leirede, Tab. IX, Fig. 7,a. Der 
er kun Antydninger til dorsale Randplader. 
Bugens Hudskelet bestaar af meget langstrakte, i En- 
derne tilspidsede Kalkstykker, der ligge i tætte, uregelmæs- 
short rays, which are placed with their broad origins so 
far apart, that the angles formed between the rays are 
obtuse. The abactinal surface, of both the disk and the 
rays, 1s beset with short, cylindric, almost truly truncate, 
paxillæ, which carry numerous calcareous spiculæ. These 
paxillæ are situated considerably apart, and are irregular 
upon the disk, whilst, on the rays, they form series more 
or less regular. 
Over the whole of the abactinal disk, there is found 
in each paxillar area, 8—10 cylindrical tentacular tubes, 
most frequently, seated around the paxille. 
They are still less numerous upon the rays, amounting, 
only, to 1—2 or at most 3, tentacular tubes, placed at the 
base of each paxilla. 
On each lateral margin of the rays, and nearest to 
the actinal surface, there is situated a series of 12—13 
large projecting paxillæ, having a flattened peduncle, and 
which are, 
upon whose extremity there is a large collection of calcar- 
eous spicule (Pl. VIII, fig. 11). 
The madreporite is slightly oblong, and is situated 
between the diskal centre and one of the mterbrachial ang- 
les, but nearest to the latter. 
The actinal surface is flat: broad interbrachial 
spaces, which are closely beset with larger or smaller pax- 
illæ, and along each of the lateral margins of the ambula- 
with 
cral furrow, there is seen a series of calcareous spines, 
which proceeds from the inner portion of the inferior margin 
of the ambulacral plates. 6—7 of these calcareous spines 
are bound together at the base, by a fibrous membrane, 
but, are free to articulate with the adambulacral plate (Pl. 
IX, fig. 14, a). 
This series of 6—7 spines is placed lengthwise; and 
they are arcuated in such a manner, that the mesial 
spines are the longest. When folded over the ventral fur- 
row, upon the corresponding spines of the opposite furrow 
margin, they interlace, and completely cover the ventral 
furrow. Besides these calcareous spines along the ventral 
furrow, there proceed from its exterior margin, transverse 
series of calcareous spines, which have their origin in the 
inferior margin of the exterior part of the adambulacral 
plates with which they articulate (Pl. IX, fig. 14, 0). 
Every transverse series has, especially, on the mesial 
part of the ray, 8—10 calcareous spines, which are, usually, 
of one uniform length (Pl. LX, fig. 14). 
The abactinal dermal skeleton consists, of small ob- 
long, calcareous ossicles, which, by joming together, form 
shorter or longer calcareous pieces, which anastomoze 
with each other, producing a reticulation with rat- 
her wide meshes, but still, not nearly so wide as in 
Solaster papposus. The calcareous reticulation in Solaster 
affinis, is, mm fact, constructed both closer and slenderer, 
than in Solaster papposus. Inthe meshes, calcareous grains 
are seen, entrenched, partly singly, and partly, several 
together (Pl. IX, fig. 7, a). There are only slight indica- 
tions of dorso-marginal plates. 
Tke actinal dermal skeleton consists, of very elongate, 
calcareous ossicles with acuminate extremities, placed upon 
