252 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



The highest averages here (June and October) do not 

 quite coincide with the maxima (April and September- 

 October) in the previous treatment where the days were 

 taken singly. The explanation is, of course, that 

 although April contains a maximum far above that of 

 Tune, it also contains in the earlier part of the month 

 many low records that pull down the average when the 

 month is treated as a whole. The maxima in high 

 average bulk of catch extending over the month, but not 

 in exceptional catches, are seen from this list to be in 

 June and October, and especially in the latter, which 

 agrees well with the curve on p. 274. 



If we look now for the largest individual hauls of a 

 single species of Copepod we find that they occur in April, 

 August and September. Tfte following are some of the 

 more important of these : — 



April 9 — Pseudocalarms elongatus 16,000 



9 — Temora longicornis 19,000 



17— „ „ 6,000 



22— ., „ 6,500 



22 — Acartia clausi 4,500 



22 — Calanus helgolandicus 4,600 



23— Acartia clausi 8,000 



23 — Calanus helgolandicus 13,480 



24— „ „ 9,240 



24— Acartia clausi 28,000 



26 — Pseudocalanus elongatus 8,700 



Aug. 10— Oithona similis 9,000 



13— „ „ 14,000 



17— „ „ 25,000 



24— Acartia clausi 23,000 



24— „ „ 29,000 



24— Oithona similis 21,000 



26 — Acartia clausi 16,500 



27— ., „ 24,700 



29 — Pseudocalanus elongatus 23,000 



Sept. 4— Acartia clausi 23,600 



4 — Pseudocalanus elongatus 36,000 



11— „ „ 21,000 



12— „ „ 33,600 



18— „ „ 25,000 



20— Oithona similis 29,270 



These also bear out the idea of maxima in April and in 

 autumn, the latter being the more important one. 



