thurier 1 det kariske Hav! omtalt Myriotrochus Rinkti, men 
da vi formene, at det er en anden Art, sandsynligvis Hux- 
ley's Chirodota brevis, han har havt for sig, og ikke Rink, 
hvilket vi senere skulle godtgjøre, saa have vi ikke optaget 
Théels Myr. Rinkii i Synonymien. 
Myr. Rinkii, St. 
(Fie. 1). 
Legemet næsten cylindrisk, lidt mere hvælvet paa 
Rygsiden og lidt smalere mod den bagerste, afrundede Ende, 
hvor den runde Analaabning findes, — er 10”” tykt og 
60” langt, foruden Tentaklerne, der ere 4”” lange. Disse: 
ere 12 i Antal, ikke retraktile, forsynede med 4—6 Cirrer 
paa hver Side, foruden Midteirren, der er den længste, 
Fig.1. Mundaabningen rund, omgiven af en Vold. Huden 
er klar gjennemsigtig, saa at baade Muskulaturen (Tvær- 
og Længdemuskler), Kalkringen, Tarmkanalen og Genera- 
tionsorganerne kunne tydelig sees. 
Paa Ryggen iagttages mange Kalkhjul, der viser sig 
at være stilkede, saa at naar Dyret under Bevægelsen træk- 
ker sig noget sammen, rage Hjulene et godt Stykke udover 
Hudens Overflade. Paa Ryggen findes Hjulene i de. to 
intermuskulære Felter, hvor der er omtrent 12 paa hver 
Kvadratmillimeter; de staa dog langtfra regelmæssigt, og 
ere midt paa Ryggen meget mere spredte, saa at der kom- 
mer neppe 10 paa hver Kvadratmillimeter. Paa Bugfladen 
derimod ere de saa overordentlig spredte, at det endog har 
sine store Vanskeligheder at opdage et og andet, og paa 
mange Exemplarer var det ikke muligt at iagttage et eneste 
Hjul. 
Den bagerste Del af Tarmen (den sidste Slynge) har 
et temmelig lige Løb og udvider sig saagodtsom ikke, idet 
den ender i den runde Anus. Der er ingen Kloak, nogen 
rythmisk Udvidning af Analaabningen finder ikke Sted: 
denne aabnes kun, naar Excrementerne skulle udstødes. 
Tarmens indre Flade er beklædt med et Lag af temmelig 
storkjærnet, fimrende Cylinderepithel; Cellerne vare fyldte . 
med et yderst finkornet Protoplasma. I Tarmindholdet 
findes hos de allerfleste (og vi have havt Anledning til at 
se en Mengde i levende Live) mange smaa, rødlige Plana- 
rier, der vare meget livlige i deres Bevægelser. Efterat de 
vare komne ud af Tarmen, vare Bevægelserne særdeles 
raske, og de levede meget godt i Søvandet. 
Myriotrochus Rinku har en svag brunligrød Farve 
paa Kroppen; Tentaklerne ere noget mørkere med en intens 
mørk, brunrød, lidt aflang Pigmentplet paa Cirrernes Spids. 
* Note sur quelques Holothuries des mers de la Nouvelle Zemble 
par Hj. Théel.. Upsala 1877. : 
round, and surrounded by a ridge. 
inhabiting the Kara Sea! mentions Myriotrochus Rink, 
but the animal he alludes to belonging, as we conceive, 
to another species, probably Huxley's Chirodota brevis, and 
not Rinkii — our reasons will be given in due course — 
we have not included Théel’s Myr. Rinkii in the list 
of synonyms. 
Myr. Rinkii, St. 
(Fig. 1). 
The body, which is almost cylindric, being but a trifle 
more conyex on the dorsal surface, and somewhat slenderer * 
at the posterior rounded extremity, where the circular anal 
aperture occurs, has a thickness of 10”” and a length of 
60™", exclusive of the tentacles, which are 4”” long. The 
latter, 12 im number, are non-retractile, and furnished on 
either side with from 4 to 6 cirrhi, exclusive of the medial 
cirrhus, which is the longest, fig. 1. The oral aperture 
The skin is in a high 
degree translucent, the muscles (transverse and longitudinal), 
the calcareous ring. the intestinal canal, and the generative 
organs being distinctly seen through it. . 
Disposed over the dorsal surface, are numbers of 
rotated calcareous corpuscles, which, being pedunculate, 
project some distance above the surface of the integument, 
when the animal, in moving, slightly contracts its body. 
On the back, these rotated corpuscles occur dispersed 
over two intermuscular spaces, about 12 to every square 
millimetre; their arrangement is however anything but reg- 
ular, and in: the middle of the dorsal region less close, 
scarcely 10 to every square millimetre. On the ventral 
surface, they are so scattered and so few in number that 
you find it difficult even to light on one here and there; 
nay, in many specimens not a single rotated corpuscle 
could be: detected. 
The posterior portion of the intestine (the last cir- 
cumvolution) takes rather a straight course, and scarcely 
expands at all, terminating as it does in the round anal 
aperture. There is no cloacum, no rhythmic expansion of 
the anus, which does not open save for the discharge of 
the fæces. The inner surface of the intestine is clothed 
with a layer of ciliated nucleal epithelium, the cylindric 
cells being filled with an exceedingly fine granulous proto- 
plasma. The contents of the intestine, im the great majority 
of individuals (and we have had opportunity of observing a 
very large number of living specimens), exhibits numerous 
small reddish :Planariæ, moving about with great vivacity. 
Out of the intestme, in particular, their motions were very 
lively, and the sea-water did not affect them injuriously. 
On the body, Myriotrochus Rinkii is of a pale brown- 
ish-red; the tentacles are somewhat darker, with:a slightly 
ovate patch of deep browny-red on the points of the cirrhi. 
° 
1 Note sur quelques Holothuries des mers de la Nouvelle Zemble, 
par Hj. Théel. Upsala 1877. 
