Bindevævet er dog overalt hyalint og rigt paa Kjærner.. 
Fødderne have den samme anatomiske Bygning, som 
Huden, kun med den Forskjel, at i deres Hulbed ender en 
Gren af Radialkairet blindt. 
ere to Slags, de smaa og de store, hvilke tidligere ere be- 
skrevne; de store ere dog tilstede i størst Mængde, 
baade paatvers og paaskraa, dog saaledes, at de paatvers 
liggende ligesom omgive Foden og ere mere sammenpakkede 
end :de skraa, der ligge mere isolerede. Imod Fodspidsen 
blive Kalkspiklerne mindre og spinklere, og ere her tildels 
sammenflettede, uden dog at danne noget Net, Fig, 14. 
Tentaklerne ere i det væsentlige bygget som Fødderne, 
kun er deres Form meget forskjellig. Skaftet er cylindrisk, 
glat og sparsomt forsynet med Kalk, og kun hist og her 
sees en Spikel; paa Bladet, der er meget tykt, er det Fli- 
gene og fornemmelig deres Rande, som have en bred Bræm 
af tætbesatte Spikler. Paa de tre store Lapper er den 
midterste Flig næsten ganske indtaget af Spikler. Overalt 
i Tentakelfligene findes afsat i Bindevævet dels under, dels 
imellem Spikellaget en stor Mængde orangefarvet Pigment, 
«der ligesom 1 Mundskivens Hud er snart samlet 1 Hobe, 
snart indesluttet i spredte Celler. ' 
Vandkarringen har som sædvanligt sine to Tilhæng, 
nemlig den Poliske Blære og Stenkanalen. . Den Poliske 
Blære er meget stor, har en kort, men bred Hals, hvormed 
den munder ud noget til Siden paa Ringkanalens Bugtlade, 
Fig. 8, e, 9, f. Dens Vægge ere temmelig tykke og have 
samme anatomisk-histologiske Bygning, som Ringkanalen ; 
dog synes dens Muskulatur at være stærkere. 
Stenkanalen, der er temmelig lang, næsten melkehvid, 
ikke meget tyk, SIg korketrækkerformigt 
langs Udførselsg gangen for Kjønsorganet, hvortil 
bunden ved et løst Binde ev, Fig. 8, 7, 29, a. Dens ydre 
Ende, Fig. 8, Å, 29; 6, perforerer Huden omtrent paa Mid- 
ten af Halsen strax foran Kraven, hvor den udmunder paa 
Hudens Overflade med. en fin, rund Aabning, der er tæt 
omgivet af større og mindre Spikler, Fig. 29, c. Dens 
indre Ende munder ud som seedy anligt 1 Ringkanalen paa 
Rygsiden, dog henimod dennes Sidedel. Stenkanalen dannes 
af et, tykt, hyalint Bindevævslag, og dens Lumen er beklædt 
med flere Cellelag, hvoraf det inderste bestaar af lange, 
flimrende Cylinderceller. Dette indre Epithel synes næsten 
ganske at udfylde Hulheden. Kalk findes ikke i Sten- 
kanalen. sare 
men fast, snor 
den er 
Her har man da en fuldstændig embryonal Tilstand, 
forsaavidt Stenkanalen er forbleven ‘aaben, hvorved Vand- 
_ karringens Indhold* umiddelbart korresponderer med ‘So- 
vandet. 
Kalkspiklerne i Fødderne 
ligge. 
structure as the skin, 
more especially their. margins, 
‘vesicle is. very large, 
-neck, through which, 
consisting of long cylindric cells, 
‘organs in the Holothuriide; but the connective tissue is 
everywhere: hyaline, and highly nuclean. 
The suckers are distinguished by the same anatomical 
saving that a branch of the radial 
vessel terminates cæcally in their cavities. As already 
described, the calcareous spicule in the suckers are of 
two kids — small and large; the large spicule, which 
occur in the greatest numbers, exhibit some a transverse * 
and some an oblique, arrangement, those transversely dis- 
posed apparently circumscribing the sucker; moreover, they 
- are closer set than the oblique spiculæ, the latter being 
comparatively isolated. Near the extremity of the sucker, 
the calcareous spicul are smaller and more slender; here, 
too, ae are’ aa interlaced, without however being sitet 
reticular, 14. 
The bee: of the tentacles 1S essentially similar 
to that of the. suckers. their form, however, widely different. 
The tentacular shaft is cylindric, smooth, and sparingly 
furnished with calcareous deposit; and here. and there only 
does an isolated spicule occur; the lobes of the pinne, and 
are densely covered with 
spicule. On the three large lobes, the medial lobule is 
almost wholly occupied by spicule. Throughout the connec- 
tive tissue of the tentacular lobules, partly beneath, partly 
between the spicular layer, is seen a mass of orange-col- 
as in the membrane of the oral 
disk, either agglomerated in patches or deposited in cells. 
oured pigment, occurring, 
The .water-vascular ring has the two normal, appen- 
dages, viz. the Polian vesicle and the sand-canal. The Polian 
and furnished with ‘a’ short, but broad 
slightly deflected, it merece on 
the ventral surface’ of the annular canal, fig. Otte 
The walls of the vesicle are rather thick, their ee 
histological structure being that of the annular canal: 
muscular development is however apparently greater. 
The sand-canal, which is rather long, in colour ap- 
proaching to milky-white, not particularly thick,. but firm 
in texture, winds in a spiral coil along the eferent duct 
of the generative organ, to which it is webbed by lax connec- 
tive tissue, fig: 8, 7; 29, a. Its outer extremity, fig. 8, h; 
29, b, perforates the skin nearly in the middle of the 
neck, immediately front of the “collar,” at which 
point. it disembogues on the surface of the integument, 
through a narrow, circular opening, densely bordered ‘with 
larger and smaller spicule, fig. 29, c. Its inner extremity, 
as is commonly the case, opens into the vascular ring on 
the dorsal side, but somewhat laterally. The sand-canal 
is composed of diaphanous connective. tissue, and has its 
lumen covered with cellular layers, the innermost layer: 
furnished with vibratile 
The cavity would seem to be almost entirely: filled 
No traces of calcareous de- 
in. 
cilia. 
up by this inner epithelium. 
posit in the, sand-canal. 
Here, accordingly, we have a true embryonic state, 
inasmuch as the sand-canal still remains open, whereby — 
the water-vascular ring and its contents are kept in direct 
communication with the sea-water. 
