31 
"hyppigste. De have en Længde fra 0.015—0.030””, ere 
fæstede til Peritoneum ved en Stilk, der udvider sig noget 
ved Tilheftningsstedet. Den frie Ende er som oftest bre- 
dere, og synes at have en elliptisk Aabning, Fig. 3. Disse 
Legemer have et kornet Indhold og svare til de, der ere 
beskrevne af Grube, Sars, Semper, Théel og Flere, hos 
Synaptiderne. Vi have kun undersøgt disse Legemer paa 
Spiritusexemplarer. 
Stenkanalen, der er yderst kort, omtr. 0.87”, bestaar 
af en noget krumbøiet Sæk, der er udfyldt med et sammen- 
hængende Kalknæt, der strækker sig noget ud paa Vand- 
karringen, just paa det Sted, hvor Stenkanalen udmunder, 
Fig. 4. — Endelig skulle vi bemærke, at paa Radialner- 
verne, lige ved deres Udspring fra Nerveringen, findes en 
Blære paa hver Nide af Nervestammen; men disse Blærer 
indeholde ikke Otolither, og bestaa af en fast gjennemsigtig 
Membran, beklædt paa sin indre Flade med Epithel, aldeles 
tilsvarende det hos .Dr. Théels Art. 
Ifølge de Undersøgelser, vi have anstillet, staar det 
for os klart, at den Art, Théel har iagttaget og tildels be- 
skrevet, ingenlunde er Myriotrochus Rinkii, men efter al 
Sandsynlighed er den samme som Huxley har beskrevet 
under Navnet Chirodota brevis; idetmindste antager Théel, 
at hans og Huxley's Art ere identiske, ligesom han for- 
mener, at dersom det konstateres, at den grønlandske Art 
stadig har stilkede Hjul, maa hans og Huxley’s danne en 
fra Rink forskjellig Art. 
Vore Exemplarer, hvoraf vi have en stor Mængde, 
ere fra Spitsbergen; de have alle stilkede Hjul, og svare 
forresten ganske til Steenstrup’s og Litken's Beskrivelser, 
ligesom vi ogsaa have havt et Originalexemplar til vor Dis- 
position, saa vi kunne ikke være i Tvivl om, at det er den 
virkelige Rinkti; vi have undersøgt. Sammenholde vi 
vore lagttagelser med de af Théel anstillede, saa fremgaar 
deraf, at Théels Art frembyder saamange Afvigelser fra 
Myriotrochus Rinkii, at den nødvendigvis maa danne en fra 
denne forskjellig Art. eg 
hu 
Myriotrochus (Chirodota) brevis, Huxley. 
1852. Chirodota brevis, Huxley. Journal of a voyage in Baffin’s Bay 
and Barrow-Strait in the year 1850—51 by P. C. Sutherland; 
Vol. 11, Appendice, pages 221 et 222. 
1865, Oligotrochus vitreus, M. Sars. Om arktiske Dyreformer i Chri- 
stianiafjorden. Videnskabs-Selskabets Forhandlinger for 1865, 
Pag. 200. Fuldstendigere beskrevet og afbildet i Fauna litto- 
ralis Norvegiæ, 3die Hefte, Pag. 49. 
Myriotrochus Rinkti, Théel. Note sur quelques Holothuries des 
Mers de la Nouvelle Zemble. Upsala, 1877. 
1877. 
however, in the great majority is petaloid. They measure 
in length from 0.015”” to 0.030””, are affixed to the perito- 
neum by a stem, which slightly expands at the point of 
attachment. The free extremity is as a rule broadest, and 
with an elliptic opening, fig. 3. These 
granulary substance, and are the ana- 
with in the Synaptide, described by 
furnished apparently 
corpuscles contain a 
logue of those met 
Grube, Sars, Semper, Théel, and others. 
specimens, we have not examined these corpuscles. 
The sand-canal, which is exceedingly short, about 
0,87” in length, has the form of a slightly arcuate sac, 
filled with a network of calcareous reticulations extending 
Save in spirit- 
out on the water-vascular ring, to the exact point at which the 
canal disembogues, fig. 4. — In conclusion, we must not 
omit to observe, that the radial nerves, at their origin on 
the nervous ring, are furnished with a vesicle on either 
side of the nervous trunk; but these vesicles do not con- 
tain Otoliths; they consist of a close-textured transparent 
membrane, clothed on its inner surface with an epithelial 
layer, exactly as in Dr. Théel’s species. 
As the result of our investigation, we feel convinced, 
that the species observed and briefly described by Dr. 
Théel, cannot be Myriotrochus Rinkii, but is most probably 
identical with Huxleys Chirodota brevis; indeed, their spe- 
cific identity is assumed by Dr. Théel himself, who opines 
that, in the event of the Greenland species invariably 
having the rotated corpuscles pedunculate, his and Huxley’s 
must be regarded as specifically distinct from Myr. Rinkii. 
Our specimens — we have a large number — are 
from Spitzbergen; they have all of them the rotated cor- 
puscles pedunculate, and in other ‘respects agree closely 
with Steenstrup’s and Liitken’s descriptions; moreover, we 
have had before us an original specimen, and hence there 
can assuredly be no doubt whatever that the subject of 
our examination was the true Rink. On comparing 
our observations with those of Dr. Théel, his species is 
found to differ in so many respects from Myriotrochus Rinkii, 
that it cannot but be regarded as specifically distinct. 
Myriotrochus (Chirodota) brevis, Huxley. 
2. Chirodota brevis, Huxley. Journal of a voyage in Baffin’s Bay 
and Barrow-Strait in the year 1850—51, by P. GC. Sutherland; 
Vol. 11, Appendix, pages 221 and 229. 
Oligotrochus vitreus, M. Sars. Om arktiske Dyreformer i Chri- 
stianiafjorden. Videnskabs-Selskabets Forhandlinger for 1865, 
Pag. 200. Described more at length, and figured, in Fauna 
littoralis Norvegiæ, Part 3, p. 49. 
1865. 
1877. Myrtotrochus Rinkii, Théel. Note sur quelques Holothuries des 
mers de la Nouvelle Zemble. Upsala, 1877. 
