of Eclmhuryh, Session 1883-84. 
723 
Scandinavian coasts, and in the North Atlantic, 40-50 fathoms ; 
except in the present instance it has not been found below 150 
fathoms, which distribution would seem to indicate that it is a 
denizen of warm as well as of cold areas, and should by rights be 
placed among the species “ common to both areas.” 
Ophioglypha Sarsii has also been obtained by the Challenger ” 
off the east coast of North America at one station (49, depth 83 
fathoms, bottom teniperature 1°'8 C. [36° F.]), and at four stations 
by the “ Blake,” at depths varying from 44 to 306 fathoms, and 
bottom temperatures 40° '5 to 51°Fi It has also been obtained off 
the coast of Greenland, in Smith’s Sound, and off Spitzbergeii, so 
that it would appear to be at home both in cold and warm 
waters, 
Opliioscolex glacialis occurs also off Spitzbergen and the Arctic, 
European, and American seas generally. It was dredged by the 
“ Willem Barents at two stations, at both of which the bottom 
temperature was below the freezing point, so that it may be regarded 
as a well-marked cold v/ater speciesi 
From these additional data it would seem that the species classed 
as “peculiar to the warm area” have established for themselves a 
fair claim to that designation ] v/hile of those marked “ peculiar to 
the cold area,” two {Ophiactis BaJlii and Ophioglypha Sarsii) must 
be removed to the category of “ common ” forms. 
We have remaining then six forms peculiar to the warm, four 
peculiar to the cold, and ten common to both warm and cold water, 
a result which decidedly favours the conclusion that temperature 
is an important factor in determining the distribution of these 
animals. 
Having ascertained to what extent the Oj^hiuroicl fatmas of the 
two areas of the Faroe Channel differ from each other, it will be 
interesting to examine how they are severally related (1) to the 
shallow-water forms of surrounding regions, that is to say, to those 
from the British and Norwegian shores clovrn to 200 fathoms; (2) 
to the forms of more northern seas (Greenland, Spitzbergen, Barents 
Sea) ; and (3) to those inhabiting the cold w^ater off the north- 
eastern coast of North America, 
