er den mindst fortrukne; men ogsaa den er bleven noget 
forrykket, ligesom den er mere langstrakt, end Tilfældet 
er længere nede paa Stilken, Fig. 30, d. Den venstre Side- 
kanal er løftet op og er trangere, Fig. 30, e, — kort sagt, 
alle Længdekanalerne ere trukne mod Dorsalfladen, der 
ogsaa er meget udvidet, ligesom Coenenchymet her er 
meget tykt, Fig. 30, f, imedens det paa Ventralfladen er 
overordentligt tyndt, Fig. 30, g. De 4 Septa ere fortrukne 
i Lighed med Kanalerne. Disse ere med Hensyn til deres 
Lumen ingenlunde formindskede, de ere kun blevne mere 
udstrakte i Bredden 1 den skedeformige Udvidning, — en 
Anordning, der bidrager til, at denne Del kan betydeligt 
opsvulme og udspændes af den i Kanalerne cirkulerende 
Vædske. Det forholder sig ikke saaledes, som Dr. Lindahl 
i sin Afhandling “om Pennatulid-Slågtet Umbellula* angiver, 
*at Dorsalkanalen er den hovedsagelig udvidede Kanal, der 
giver den skedeformige Udvidning sin Form, og at den ved 
en eller anden Anledning, ved indesluttede Gasers Expan- 
sion kan blæres op;“ Forholdet er som ovenfor antydet 
meget simplere. 
Figur 31 illustrerer Længdekanalerne lige ved Be- 
gyndelsen af Rachis. Axen er her endnu mere fordreiet; 
Ventralkanalen er ganske fortrukken, Fig. 31,4; Dorsalkana- 
len, Fig. 31, b, har næsten sin naturlige Form, naar undtages, 
at den er udvidet efter Dorsalfladens Bredde, og Sideka- 
nalerne, Fig. 31,6, c, ere ligeledes betydeligt udvidede paa 
Dorsalsiden. 
Axen men udvider sig stærkt mod Coenenchymvæggen, Fig. 
BO), SL 
smalere, indtil de op imod Terminalpolypen ophøre, idet 
begge Septa paa hver Side smelte sammen, saa at der 
bliver kun to Kanaler, nemlig Dorsal- og 
Samtlige Kanaler ere temmelig smale ved 
Op igjennem Rachis blive Sidekanalerne noget 
Ventralkanalen, 
hvoraf den første bliver trangere og trangere, indtil ogsaa 
den forsvinder nogle Millimeter fra Terminalpolypen. Ven- 
tralkanalen, der er endnu temmelig vid, og hvori Axen 
ender, gjør en stærk Boining under Endepolypen, smalner 
betydeligt af og ender paa Ventralsiden, 4—5”” under Ter- 
minalpolypens Grund, i en rund, gjennemboret Papille. 
I den bulbøse Del af Stilken ere de 4 Længdekanaler 
kun liden Forandring underkastede, hvorimod de 4 Septa 
mærkeligt modificeres, ligesom et Septum transversale op- 
Omtrent 10”” fra Stokkens Grund deler det ven- 
tral-laterale Septum paa hver Side sig 1 to Længdefolder; 
træder. 
den ene, bagerste, Fig. 32, a gaar hen og insererer sig 
langs Sidedelen af Axens Skede lige ned til dennes Ende, 
om hvilken den slaar sig, og er her sammenyoxen med den 
tilsvarende fra den anden Side, Fig. 33, a; den anden, for- 
reste, Fold, Fig. 32, b, der er den tykkeste, gaar paaskraas 
nedad og indad foran Axeskeden og møder paa Midten af 
Ventralfladen en tilsvarende Fold fra den anden Side, med 
42 
towards the lateral canal (fig. 30, 0). The right lateral canal is 
drawn towards the dorsal canal, and is pretty much dilated 
towards the wall of the sarcosoma (fig. 30, c). The dorsal canal 
is the least distorted, but, it is, also, somewhat displaced, 
whilst, also, it is more elongated, than is the case further 
down the stem (fig. 30, d). The left lateral canal is 
elevated and narrower (fig. 30, e); in short; all the longi- 
tudinal canals are drawn towards the dorsal surface, which, 
also, is much dilated, and the sarcosoma is, also, very 
thick here (fig. 30, f); whilst, on the ventral surface, it is 
extremely thin (fig. 30, g). 
similar to the canals. 
The 4 septa are distorted, 
These are, so far as regards their 
channel, in no way diminished; they have, only, become 
dilated in breadth throughout the sheath-formed dilation, 
an arrangement which conduces to the canals becoming cap- 
able, of being considerably swollen and expanded by the 
fluids circulating in them. It is not the case, as Dr. Lindahl 
in his memoir “om Pennatulid-Slågtet Umbellula* states 
it to be, viz. that the dorsal canal is the principal dilated 
canal which gives to the sheath-formed dilation it’s shape, 
that it 
expanded 
be 
The 
other occasion, 
by the elastic action of the enclosed gases. 
and may on some one or 
real case is, as above explained, much simpler. 
Fig. 31 
Q illustrates the longitudinal canals as seen, 
exactly at the commencement of the rachis. 
The axis 
is, here, still more twisted; and the ventral canal is quite 
distorted (fig. 31, a). The dorsal canal (fig. 31, 6) has 
almost the natural shape, with the exception, that it is 
dilated throughout the breadth of the dorsal surface; and the 
lateral canals (fig. 31, c, c) are also considerably dilated 
All of the canals rather 
close to the axis, but become greatly dilated towards the 
wall of the sarcosoma (fig. 30, 31). 
the rachis, the 
on the dorsal side. are narrow 
Upwards, throughout 
lateral canals become somewhat narrower, 
until they altogether cease close up towards the terminal 
polyp, owing to both the septa on each side becoming 
fused together, so, that there are, then, only two canals, 
namely, the dorsal and the ventral canals, of which, the first 
becomes narrower and narrower, until, also, it ceases a 
few millimetres distant from the terminal polyp. The vent- 
ral canal, which is still, tolerably wide; and in which the 
axis terminates; makes a sharp curve under the terminal 
polyp; then becomes considerably reduced m width, and 
terminates on the ventral side, 4—5”” below the base of 
the terminal polyp, in a round perforated papilla. 
In the bulbous part of the stalk, the 4 longitudinal 
canals experience, only, very little change; whilst, on the 
other hand, the 4 septa are remarkably modified, and a 
septum-transversale appears. About 10”” from the base 
of the stalk, the ventro-lateral septum becomes divided 
on each side, in two longitudinal folds; the posterior fold 
(fig. 32 a), proceeds to insert itself along the lateral part 
of the sheath of the axis, right down to it’s extremity, 
round which it entwines itself; and, it becomes, here, 
conereted with the corresponding fold from the other side 
(fig. 33, a). The other, anterior fold (fig. 32, 0), which 
is the thickest one, proceeds diagonally, downwards and 
