A MEMOIR
ON THE
ECHINODERMATA OF THE ARCTIC SEA
TO THE
WEST OE GREENLAND.
HOLOTHTTKOIDEA.
J udging from the results of such dredging as has hitherto been conducted in high
latitudes, the Holothuroidea as a group do not appear to extend in the North-Atlantic
area to a very great distance within the Arctic Circle. Exception must be made,
however, in the case of Myriotroclius JRinJcii, Stp., which was obtained by the Polar
Expedition of 1875-76 in Discovery Bay, lat. 81° 41' N., the most northern locality at
which any Holothuroid has yet been found. The other members of the order have not
been recorded in this area beyond the 70th parallel; but as they occur in higher latitudes
elsewhere, it has been deemed expedient to include those which extend beyond
the Arctic Circle (66° 30' N.) in the present description.
The following is a list of the Holothuroid s in question:—
1. Cucumaria frondosa (Gunner), Forbes.
2. Cucumaria calcigera (Stimp.), Selenka.
3. Orcula Barthii, Troschel.
4. Psolus phantapus (Strussenf.), Jäger.
5. Psolus Fabricii (D. & K.), Lütken.
6. Chirodota lems (Fahr.), Grube.
7. Myriotrochus BinJcii, Steenstrup.
B