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73
forreste Rand noget længere, end paa Jeffreysii, men nogen
anden Forskjel er der heller ikke.
Med Hensyn til Vandkarsystemet, saa ere
Tentakelampullerne meget lange ligesom hos Jeffreysii, Fig. 30. c.
Den Poliske Blære er kolbeformig og har en lang Stilk.
Stenkanalen. Fig. 30. d. er meget lang og besat med
Kalkfletninger lige til dens Udspring fra Vandkarringen,
saaledes nemlig, at paa den yderste Halvdel danne
Fletningerne Ringe ligesom hos Troch. Thomsonii.
Madreporpladen danner en liden fremspringende Knop, der er fjernet
omtrent 1"" fra Stenkanalens Befæstningssted paa den indre
Flade af Kropsvæggen, og ligner den hos Jeffreysii.
Kjønsorganerne ere noget forskjellige hos det
forskjellige Kjøn.
.Hos Bønnen er Kjønsorganet overordentlig langt,
naar næsten lige til Kloaken, Fig. 30, e. Det er fæstet
ved et kort, fortykket Mesenterium til Tarmvæggen, just
paa det Sted, hvor Maven gaar over i Tarmen, og bestaar
af to Hovedstammer, af hvilke den venstre er den korteste;
fortil forene de sig og danne en lang Udførselskanal, som
løber et langt Stykke ved Siden af Stenkanalen; bagtil
forgrener hver Stamme sig i mange tynde, lange cylindriske
Blindsække. hvoraf flere vare næsten opfyldte af
Zoo-spermer.
Hunnens Kjønsorganer ere meget kortere, men dog
længere end hos Jeffreysii, og forsynet med langt flere
Blindsække, hvori fandtes en Mængde mere eller mindre
udviklede Æg, Fig. 28.
Fårven grnagrøn med hvid Mundskive, Tentakler,
Generationspapille og Halespids hvid.
Findested.
Station 290..
Slægtskarakter. Ankyroderma
Legemet cylindrisk. Den forreste Ende tvers
afskaaren. Mundskiven forsynet med 15 rørformige Forlængelser,
afvexlende med 15 aflange Fordybninger, hvori findes 15
papilformige Tentakler. Den bagerste Ende haleformig
forlænget. Kloakaabningen omgiven af 5 Papiller. Huden
forsynet med gjennemborede Papiller samt særegne
Kalklegemer, bestaaende af 5—6 i Stjerneform liggende
spatelformede Kalkstave, fra hvis Midte reiser sig et Kalkanker.
Ingen Fødder. To Tarmappendices (Lungetræer).
Den norske Kordliavsexpedition. Danielssen og Koren: Holothurider.
to a greater extent, and the points on the anterior margin
may be somewhat longer, than in Jeffreysii; other difference
there is none.
As regards the aquiferous system, the tentacular
am-pullæ are exceedingly long, fig. 30, c. The vesicle of Poli
is clavate in form, and has a long pedicle.
The sand-canal, fig. 30, d, is very long, and is
furnished with calcareous reticulations that extend to its
point of origin on the water-vascular ring, the said
reticulations exhibiting on ■ the outer half of the stem an
annular arrangement, as in Trochostoma Thomsonii. The
madreporic body occurs as a small projecting knob, distant
about 1"" from the point at which the sand-^anal is
webbed to the inner wall of the body, and resembles that
in Jeffreysii.
The generative organs vary somewhat in the different
sexes.
The male has the generative organ exceedingly long,
reaching almost to the cloacum, fig. 30, e. It is webbed
by a short, inspissated mesentery to the wall of the
intestine, in the exact spot where the stomach opens into the
latter, and consists of two stems, that on the left side
being the shortest; anteriorly, these stems unite to form a
long eferent duct, which passes for a considerable distance
alongside the sand-canal; posteriorly, each of the stems
divides into numerous long, thin, cylindric cæca, several of
which were full of spermatozoa.
In the female, the generative organ is much shorter,
but of greater length, however, than in Jeffreysii, and
furnished with a great many more cæca, in which were found
numbers of ova, more or less developed, fig. 28.
Ground-colour grey-green; the oral disk, the tentacles,
the papilla of the generative organs, and the tip of the
caudiform appendix white.
Locality.
Station 290.
Generio Character: Ankyroderma.
Body cylindric. Anterior extremity truncate. Oral
disk furnished with 15 tubular prolations, alternating with
as many oblong depressions, in which are 15 papillary
tentacula. Posterior extremity caudiform elongate. Cloaca!
opening surrounded by 5 papillae. Skin furnished with
perforate papillæ, and with characteristic calcareous
corpuscles composed of from 5 to 6 spatulate calcareous rods,
arranged in a stellar form, from the centre of which
protends a calcareous anchor. No suckers. Two intestinal
appendices (respiratory trees).
10
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