198 TKANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



M ATEi? lAL Available . 



The coUectioiis made this year have amounted to 

 over 500 — within the limited area oft: tlie Isle of Man to 

 which this " Intensive Study"' applies. This series 

 compares with those of former years, as follows: — 



Tliese make about 1000 in each of tlie thi-ee vertical 

 columns —Spring, Autumn and Bay -and from over oOO 

 to over 750 for each of the five years in question. 



The remarks made in tlie previous Eeports about tlie 

 nets used and the methods adopted ap])ly again; but for 

 the vertical hauls we have used almost wholly the Nansen 

 net, either ()])en throughout the haul or closed after 

 traversing a certain zone. The other nets used were 

 " coarse " and " fine " (No. '^'0 silk) horizontal, 

 '"funnel" net, '"Otter" net, '"medium Nansen," 

 "large Nansen," and "Shear" net. All these nets 

 and tlie methods in whicdi we use them have been 

 sufficiently described in the ])revious parts of this study. 



PLANKTON OF PORT ERIN BAY IN 1911. 



The plan adopted lor the last few years in regard to 

 the ])hiiik1oii saiiiph's fiom Port I'ain ]5ay has been to 

 take two horizontal (coarse and flue nets) and one vertical 

 haul twice each week' throughout the year — thus giving 



