108 THE DEPTHS OF THE SEA. [CHAP. 111. 
Thorshavn about noon, steaming east by south, so 
as to cross the deep channel between Féroe and 
Shetland. Our first two stations were on the Feroe 
plateau, at depths a little over a hundred fathoms, but 
the third sounding, taken in the evening of the 24th 
at a depth of 317 fathoms, gave a bottom temperature 
of —0°9 C.; we were therefore once more in the cold 
current. Having kept the same course under easy 
steam during the night, we took a sounding next 
morning, lat. 61° 21’ N., long. 3° 44° W., at a depth of 
640 fathoms, with a bottom temperature of — 1°1C. 
A haul of the dredge brought up rolled pebbles and 
Fic. 12.—Pourtalesia jeffreysi, WyvILLE THomson. Slightly enlarged.! (No. 64.) 
fine gravel with few animal forms, but among them 
one of extraordinary interest, a large specimen of a 
fine species of the genus Pouwrtalesia, a heart-urchin, 
one of whose congeners had been discovered by 
M. de Pourtales in the gulf-stream explorations off 
the American coast, and a second by Mr. Gwyn 
Jeffreys near Rockall. The present example (Fig. 12) 
was much larger than either of those previously 
dredged, and it appeared to be specifically distinct. 
' T have the pleasure of dedicating this interesting species to our 
accomplished colleague, J. Gwyn Jeffreys, F.R.S. 
