SEA-FISHERIES LABORATORY. 159 
C. curvisetum) with, occasionally, large numbers of 
Thalassiosira gravida and T. nordenskiéldi. Fig. 11 
shows, under a higher magnification, part of an 
abundant gathering of the last-named Diatom. 
COMPARISON OF HAULS AT THE SAME STATIONS IN 
DIFFERENT YEARS. 
We now give in the tables that follow a detailed 
analysis of the constitution of the catch from those 
stations* which are represented in more than one year, 
viz.:—Off Ardmore, Loch Hourn, off Canna and the 
other Small Isles, the Firth of Lorn, and off Skate 
Island. 
Diluted samples of the catch were examined, one 
’ 
cubic centimetre at a time, in the “‘ Rafter’’ counting 
cell,t and the method of estimating the number of 
individuals was precisely the same as that employed in 
reporting on the Irish Sea plankton during the last few 
years. 
In the tables that follow the symbol x indicates 
mere presence, in very small numbers, to which we attach 
no great importance. 
* With the exception of Loch Nevis, accidentally omitted from the 
tables, the results in that locality are very much the same as those 
for Loch Hourn. 
+ See Kofoid—Plankton Studies, in Bull. Dllinois State Lab. Nat. 
Hist, Vol; V, 1897. 
