dannes af to aflange Sække, Fig. 20. a, a, der forene sig | 
til en fælles temmelig lang Udførselsgang, Fig. 20, b, der | 
er fæstet til Tarmen tæt ved dennes Begyndelse med en | 
kort Bindeværvstraad, og løber fortil ved Siden af Sten- 
kanalen for at udmunde paa Midten af Ryggen, strax bag | 
Tentakelranden, Sækkene vare opfyldte af Æg i forskjel- 
lige Udviklingsstadier, Fig. 20, c. 
Farven. 
Huden i levende Live vandklar med fine glindsende 
Punkter. Tentaklernes Blade brunt pigmenterte i Ran- 
den. Å | 
Findested. 
Stationerne 283, 295 og 312. 
Slegtskarakter. 
Legemet cylindrisk, fodløst. tilrundet i den bagerste | 
Ende, Kjønnet adskilt, mgen Tarm-Appendices (Respira- 
tionsorganer). Huden forsynet med to Slags forskjelligfor- | 
mede Kalkhjul. Det ene Slags Hjul har vingeformede Ra- 
dier, og fra Peripheriens indre Rand udgaa Tænder. Det | 
andet Slags Hjul er mere end dobbelt saa stort, har lige- | 
ledes vingeformede Radier, men fra Peripheriens ydre Rand | 
udgaa lange indadvendte Tænder. 12 fingerformede Ten- 
takler, der kunne skjules i Legemet. a | 
Artskarakter. 
Legemet 10—12”™ langt, eylindrisk, bredere og af- 
rundet 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 Tender 
imellem hver to Radier. De store Hjul have i Regelen 
fra S—11 Radier, og fra Peripheriens ydre Rand udgaa 
ligesaa mange lange tilspidsede Tænder, som der er Antal 
af Radier. 12 Tentakler forsynede med 3 delte. finger- 
formede Blade. 
the female is composed of 2 oval sacs, fig. 20, a, a, whieh 
unite to form a rather long eferent duct, fig. 20, b, web- 
bed 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 mi- 
nute glittering points studding its surface. Tentacular 
pinne brown along the margin. 
Locality. 
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 caleareous wheel-shaped spiculés, 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 peta- 
loid 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, eylin- 
dric, 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, differmg 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. Danielssen og Koren: Holothurider. 
