SEA-FISHERIES LABORATORY. 145 
appearance from those taken off Ardmore in Mull, and 
from those taken oft the Island of Canna; also those 
taken in the Lynn of Morven at one end of the Sound of 
Mull ditfer from those taken between Mull and Ardna- 
murchan at the opposite end. Again, in the Southern 
series (the Clyde sea-area) the hauls from off Skate 
Island, in the entrance to Loch I’yne, differ considerably 
in appearance from those taken further south in the 
Sound of Bute and the Firth of Clyde off Arran. 
As examples of (B), the Loch Iyne vertical hauls are 
always characterised by the abundance of large Cope- 
poda; the hauls off Canna and elsewhere in the sea of the 
Hebrides by the prevalence of Diatoms; those in the 
Firth of Lorn by a fine zoo-plankton, mixed with some 
phyto-plankton, and those in the Sound of Raasay, on 
the North of Skye, by a much coarser and more purely 
oceanic zoo-planktou. 
Thus we have evidence that off the north-west coast 
of Scotland, at one time of year (July) in several 
successive seasons the plankton, as sampled by vertical 
hauls, was of different types (zoo- and phyto-plankton) 
in different localities, but preserved a constant character 
in each. 
Let us now give the list of the Scottish localities im 
full, with some particulars as to the nature of the catch 
in each case :— 
At SOUTH. AND BAST £02 42GAN TY Ri: 
(CLYDE SHA-A REA?) 
I. In NortH CHANNEL. 
(1) Off Portpatrick, 103 fm.; August Ist, 1909.— 
Chiefly zoo-plankton: Calanus, Pseudocalanus, and 
Oithona, Also Rhizesolenia spp., Coscinodiscus radiatus, 
