hverken paa det levende Dyr eller det i Spiritus opbeva- 
rede kan iagttage Kalkplader paa Bugens ydre Flade. 
2 Rækker cylindriske Fodder med Sugeskive og uden 
Spikler, Tab. XI, Fig. 2, b. 4, c. Ingen Pedicellarier. 
Ryghudens indre Flade viser sig ved Indtørring at 
være ligesom overstrøet med yderst fine, ved blotte Øie neppe 
synbare Kalkkorn, der ikke rage langt ind i Huden og 
ikke staa i nogensomhelst Forbindelse med Ryggens Kalk- 
pigge. Ved meget stærk Forstørrelse vise disse Kalkkorn 
en afrundet, punkteret Overflade, Tab. XI, Fig. 5. 
Henimod Søstjernens Rand, hvor Ryggen gaar over 
i Bugen, findes paa den indre Flade en bueformig Række 
af smaa, flade, uregelmæssige Kalkplader, der staa langt 
fra hverandre, rage kun lidet ind i Hudens Tykkelse og 
bære ingen Pigge, Tab. XI, Fig. 6, e. Disse Plader 
kunne vel betragtes som rudimentære dorsale Randplader. 
Noget Skelet findes ikke i Ryghuden; men de fine 
Kalkkorn, ligesom de nylig beskrevne Plader, ere svage 
Antydninger til et saadant. 
Paa den indre Bugflade sees lignende Kalkkorn; men 
foruden dem er der ogsaa et virkeligt Hudskelet. 
Hudskelettet paa Bugtladen dannes af 3 bueformige 
Rækker flade, temmelig regelmæssigt formede Kalkplader, 
Tab. XI, Fig. 6. Disse ere paa den indre Flade ophgi- 
ede paa Midten og ved stærkt Bindevæv forenede med 
hverandre, hvorved hele Rækken faar Udseende af en Ro- 
senkrands. 
Den yderste Række, Tab. XI, Fig. 6, f, er den 
længste, og idet den kommer hen til Armens Rand, støde 
Pladerne til Adambulaeralpladerne uden at forene sig med 
disse. Paa enhver Plades ydre Flade er der 3 temmelig 
tykke Pigge, der som oftest staa i Trekant, Tab. XI, Fig. 
4, a. Det er denne Række, som danner de ventrale Rand- 
plader med sine Pigge. 
Den anden Række Plader bestaar paa Midten af 2 
—3 adskilte Rader, Tab. XI, Fig. 6,9, men bliver til en 
enkelt, idet de nærme sig Armens Rand. Enhver af disse 
Plader bære en eller to Pigge. 
Den tredie, inderste Række, Tab. XI, Fig. 6, h, er 
som den første enkelt, temmelig kort, og hver Plade bærer 
en Pig. Imellem disse Pladerækker sees spredte Plader, 
der dels bære en Pig, dels ere uden saadan. 
Ambulacralpladerne have brede, bladformige Forlæn- 
gelser, Tab. XI, Fig. 6, a. 
Adambulacralpladerne, Tab. XI, Fig. 6, b, ere 
sten firkantede, have et Indsnit paa den indre Flade, 
optager Ambulacralpladens ydre, afrundede Proces, og 
deres underste Flade findes 3 divergerende Pigge, 
næ- 
der 
paa 
hvoraf 
den, der vender ind mod Ambulacralfuren, er den længste. 
specimens preserved in spirit, is it possible, to observe the 
calcareous plates of the exterior actinal surface. 
There are 2 rows of cylindrical suckers with sucker- 
disks, and free from spicule (Pl. XI, fig. 2,b. 4,c). There 
are no pedicellariæ. 
When dried, the inner surface of the integument of 
the abactinal surface, appears as if it was sprinkled with 
extremely minute calcareous grains, barely visible to the 
naked eye, and which do not sit deeply in the integument. 
These have no connection whatever with the calcareous 
spines of the abactinal surface. On being powerfully mag- 
nified, these calcareous grains present a rounded punctu- 
ated surface (Pl. XI, fig. 5). 
Towards the margin of the starfish; where the abact- 
inal and actinal surfaces meet; there occurs on the inner 
surface, an arcuate series of small, flat, irregular calcareous 
plates, situated considerably apart from each other, and 
only slightly, protruding into the body of the integument, 
and these plates carry no spines (Pl. XI, fig. 6, e) 
The plates referred to, may, presumably, be considered 
to be rudimentary dorso-marginal plates. 
No skeleton is found in the dorsal integument; but 
the minute calcareous grains, and the plates just lately de- 
scribed; are faint indications of a skeleton. 
On the inner actinal surface, similar calcareous grains 
are seen; but besides these, a real integumental skeleton is 
also observed. 
The integumental skeleton of the actinal surface, is 
formed by 3 arcuate series of flat, rather regularly formed 
calcareous plates (Pl. XI, flg. 6). Their surfaces 
are elevated in the middle, and are united to each other by 
strong connective tissue, giving to the entire series the ap- 
inner 
pearance of a rosary. 
The exterior series (Pl. XI, fig. 6, f), is the longest, 
and as it approaches to the margin of the ray, the plates 
abut upon the adambulacral plates, without, however, unit- 
ing to these. On the exterior surface of each plate, there 
are 3 pretty thick spines, most frequently placed triangul- 
arly (Pl. XI, fig. 4, a). It is this series which forms the 
ventro-marginal plates, with their spines. 
The second series of plates consists, in the mesial 
part; of two series of 2—3 separated rows (Pl. XI, fig. 
6, g) which, as they approach the margin of the ray, be- 
come one. Hach of these plates carries one or two spines. 
The third or imost series (Pl. XI, fig. 6, h) is, like 
the first series, single, rather short, and each of its plates 
carries one spine. Scattered plates are also visible be- 
tween these series of plates, carrying sometimes, one spine, 
and sometimes without any spine. 
The ambulacral plates have broad leaf-formed prolong- 
ations (Pl. XI, fig. 6, a). 
The adambulacral plates (Pl. XI, fig. 6, b) are al- 
most square, and on the inner surface, have a groove that 
includes the ambulacral plates exterior rounded process. 
Upon their inferior surface, 3 diverging spines are seen, of 
which, the one that turns inwards towards the ambulacral 
furrow is the longest. 
