vendige F lade, og fortsætter sit Lob fortil, hvor den ud- -: 
breder sig tragtformig over Tentakelkarrene for at fæste 
sig «paa Mundskiven, Tab. I, Fig. 8, u. Den maa’ ganske 
separeres bort. for at Vandkarringen med dens Kar kan 
komme tilsyne, hvilket har sine særdeles store Vanskelig- 
heder. | 
_. Vandkarringen er rund og omslutter Spiserøret, hvor- 
til den er. nøie' bunden ved Bindevæv, Fig. 9, b.. Dens 
nøie Forbindelse med Svælget gjør, at Svælgsinus er ganske 
afsluttet og korresponderer ikke med Kropshulheden. Vand- 
karringen er omtrent 2””- bred, maaske nogét bredere, 
naar den er udspændt, og fra dens forreste Del udgaa 5 
Hovedstammer, Fig. 9, c, c, der ere brede ved Udspringet, — 
men smalnes snart af, indtil de omtrent 1”” fra Ringen, 
hvor de dele sig, indtage 1”” Tykkelse, Fig. 9,.d. Dette 
er dog*noget forskjelligt; saaledes ere de to Sidekar noget 
tykkere. Af de 5 Kar tilhøre 2 Biviet og 3 Triviet. De 
.to Rygkar dele sig hver i 2 Grene, der gaa til hver sin 
Tentakel. Af Bugkarrene deler det midterste ‘sig i to. 
Grene, Fig. 9, d, der gaa til hver sin Tentakel, imedens 
de to Sidegrene dele sig hver i 3 Grene, Fig. 9, e, e, af 
hvilke den ene danner Længdekarret og «de to øvrige gaa 
til hver sin Tentakel. Der er altsaa 10 Tentakelkar og 2 
Liengdekar. Længdekarret gaar foran Midtpartiet af Kalk- 
ringens enkelte Stykker henimod Mundskiven, løber. saa 
hen til Længdemuskelens Insertionspunkt, hvor det i Mu- 
skelens gaffelformige Deling gaar bagtil, dækket af Muske- 
len, liggende imellem denne og Radialnerven. Naar Længde- 
karret er kommet hen til den første Fod, afgiver det en 
Gren til denne, der ender blindt. Ved Fodens Grund 
ligger en aflang Ampulle, der er bredere ved Udspringet, 
smalere indad og er fæstet til Hudens indre Flade, dels 
ved  Bindevæv, dels ved Muskelbaand, Fig. 2, d, 26, b. 
Ampullens: udvendige Væg ligger i umiddelbar Bergrelse 
med Huden, imedens den, der vender mod Kropshulheden 
(altsaa den indre) er beklædt af Peritoneum. Den er dan- 
net af et hyalint Bindevævslag og af en Muskelhud, som 
bestaar af stærke Ring- og Længdemuskler. Hvor Ampullen 
er fæstet til Huden, ser det ud, som om den var nedsænket 
1 denne, men saa er ikke Tilfældet. Hudens Tyermuskler 
ere vegne fra hverandre for at give Plads for Ampullen, 
_og derved bliver Grændsen, som dannes af de fra hver- 
andre drevne Tvermuskler. noget ophøiet. 
Det er jo et ganske særegent Forhold. men staar 
dog ikke ganske isoleret; thi hos Elpidia træffer man paa 
noget lignende. Enhver Fod er forsynet med en. saadan 
Ampulle, der dog-aftager noget i Størrelse paa den bagre 
Kropsende, hvor de tillige have en mere skraa Stilling, 
Fig. 2. Vandkarringen, tilligemed de fra den udgaaende 
Kar, er dannet af de samme Lag, som ere egne for 
disse Organer hos Holothuriderne i Almindelighed; men 
LIL 
and longitudinal muscles. 
portion of the inner surface of the annular canal; from 
thence it continues. its forward course; and, after expanding 
funnel-wise to enclose the tentacular vessels, is webbed to 
the oral disk, Pl. I, fig. 8, u. It must be wholly’ detached 
ere the water-vascular ring, with its 
discerned, a matter of very considerable difficulty. 
vessels, can be 
The water-vascular ring, which is round, encircles the 
esophagus, both organs being webbed together by connective 
| tissue, fig.9,b. Hence, the pharyngeal sinus, by reason of this 
close connexion, is completely isolated, and does not corre- 
spond with the perivisceral cavity. The water-vascular ring 
.is about 2”” in diameter, possibly a trifle more when fully 
expanded; and from its anterior part protend 5 principal 
stems, fig. 9, c, c,: which are broad at the base, or origin, 
but rapidly narrow, .till their thickness about 17” from 
the margin of the ring, where they branch off, does not 
exceed 1””, fig. 9, d. This, however, is not always the 
case; the two lateral vessels, for instance, are somewhat 
thicker. Of the 5 vessels, 2 belong to the bivium, and 3 
to the trivium. The 2 dorsal vessels are bifurcate, the 
branches protending each to a tentacle. Of the ventral 
vessels, that in thé middle is bifurcate, fig. 9, d, the two 
branches protending each to a tentacle, whereas the two 
lateral vessels are trifurcate, fig. 9, e,e, one of the branches 
forming the longitudinal vessel, and the remaining two 
protending each to a tentacle. Hence there are 10 tentac- 
ular vessels and 2 longitudinal vessels. The longitudinal 
vessel passes in front of the central section of the segments 
‘of the calcareous ring to the oral disk, where it bends 
backwards in the fureated division of the muscle, covered 
by the muscle extending between the latter and. the radial 
nerve. On reaching the first sucker, the longitudinal ves- 
sel furnishes it with a branch, terminating cecally. At 
the base of the sucker an: oblong ampulla, 
rather broad at its origin and narrower within, which - 
is attached to the inner surface of the integument, partly 
by connective .tissue and partly by muscular bands, figs. 
DO The exterior wall of the ampulla is in 
contact with the skin, whereas that facing the perivisceral 
is seen 
‘cavity: (the interior) is covered by.the peritoneum. It con- 
sists of a layer of hyaline connective tissue, and of a mus- 
cular integument. the latter composed of powerful circular 
At the’ point of, attachment, the 
ampuila appears embedded in the skin; but such ‘is not the 
case: the transverse muscles of the integument diverge to. 
make. way for the ampulla, and. hence there is a slight 
elevation of the skin along the boundary-line, resulting from 
a divergence of the transverse muscles. 
This is certainly a very peculiar feature. though not 
altogether unique, something analogous being met with in 
the genus Elpidia. Every sucker, or foot, is furnished 
with one of these ‘ampulla, which slightly diminish in mag- 
nitude on the posterior extremity of the body, their position, 
The water-vascular ring, 
© 
too, being there more oblique, fig. 2. 
and the vessels proceeding from it, are composed of the 
same tegumentary layers that generally constitute those 
OY 
