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41
dannes af to aflange Sække. Fig. 20. a, a, dér forene sig
til en fælles temmelig lang Udførselsgang. Fig. 20. b,
deier fæstet til Tarmen tæt ved dennes Begyndelse med en
kort Bindevævstraad, og lober fortil ved Siden af
Stenkanalen for at udmunde paa Midten af Ryggen, strax bag
Tentakelranden. Sækkene vare opfyldte af Æg i
forskjellige Udviklingsstadier. Fig. 20. c.
Farven.
Huden i levende Live vandklar med tine glindsende
Punkter. Tentaklernes Blade brunt pigmenterte i
Randen.
Findested.
Stationerne 283. 295 og 312.
Slægtskarakter.
Legemet cylindrisk, fodløst, tilrundet i den bagerste
Ende. Kjønnet adskilt, ingen Tarm-Appendices
(Respira-tionsorganer). Huden forsynet med to Slags
forskjelligfor-mede Kalkhjul. Det ene Slags Hjul har ringeformede
Radier, og fra Peripheriens indre Rand udgaa Tænder. Det
andet Slags Hjul er mere end dobbelt saa stort, har
ligeledes vingeformede Radier, men fra Peripheriens ydre Rand
udgaa lange indadvendte Tænder. 12 fingerformede
Tentakler, der kunne skjules i Legemet.
Artskarakter.
Legemet 10—12"" langt, cylindrisk, bredere og
afrundet i den bagerste Ende. Mund- og Analaabningen
central. Huden glasklar, overalt besat med 2 Slags
for-skjelligformede Hjul. Det ene Slags ere stilkede, smaa,
forsynede med i Regelen 11 Radier, og fra Peripheriens
indre Rand udgaa i Almindelighed to trekantede Tænder
imellem hver to Radier. De »tore Hjul have i Regelen
fra 8—11 Radier, og trå Peripheriens ydre Rand udgaa
ligesaa mange lange tilspidsede Tænder, som der er Antal
af Radier. 12 Tentakler forsynede Qied 3 delte,
fingerformede Blade.
the female is composed of 2 oval sacs. fig. 20, a, a, which
unite to form a rather long eferent duct. fig. 20. b,
webbed to the intestine in close proximity to its origin by a
short membranous filament, and extending forwards along
the sand-canal; it disembogues in the middle of the back,
immediately posterior to the tentacular margin. Both sacs
were full of ova in various stages of development, fig. 20, c.
Colour.
In living examples, the skin is transparent, with
minute glittering points studding its surface. Tentacular
pinnæ brown along the margin.
Looality.
Stations 283. 295. and 312.
Generic Character.
Body cylindric. without feet, rounded at the posterior
extremity. The sexes separate; no intestinal appendices
(respiratory tubes). The integument furnished with two
kinds of calcareous wheel-shaped spicules, differing alike in
form and size. One has petaloid radii, and teeth* projecting
.from the inner margin of the periphery; the other, more
than twice the size of the first, also provided with
petaloid radii, but with long teeth, directed inwards, on the
outer margin of the periphery. Twelve digitate tentacles,
which admit of being retracted into the body.
Specific Character.
Body, measuring from 10"" to 12"" in length,
cylindric. broadest and rounded at the posterior extremity.
Position of mouth and anal opening central; skin crystalline,
in which are everywhere imbedded 2 kinds of calcareous
wheels, differing alike in form and magnitude. The one,
small and. pedunculate, is generally furnished with 11
radii, and on the inner margin of the periphery there
are. as a rule, two triangular teeth, placed each between
two radii. The large wheels have mostly from 8 to 11
radii, and from the outer margin of the periphery project
as many long, pointed teeth as there are radii. Twelve
tentacula. with three digitate pinnæ.
Den norske Nordhavsexpedition. Dauielssen og Koren: Hnlotliurider.
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