294 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



COPEPODA. 



We give here, as usual, a short summary of the 

 occurrence of the commonest species of Copepoda. 



Calanus jinmarchicus. — In previous years the summer 

 maximum has usually been in July, with a second climax 

 in October (September in 1913) ; but in 1914 the maxi- 

 mum was in August (7,320 on the 6th), and the numbers 

 were then low till the end of the year. 



Pseudocalanus elongatus. — The maximum haul this 

 year was 41,000 on June 22nd, but the monthly average 

 for April was higher than that for June. In the curve of 

 the monthly averages we have three high peaks, in April, 

 June and August, with depressions in May and July. 



Oithona similis. — The maxima this year were in July 

 and November, with a smaller one in September. In 

 July the largest hauls were 54,180 on the 2nd, and 73,600 

 on the 24th ; while in November there was an unusually 

 large haul of 199,300 on the 9th. This late autumn 

 maximum was much higher than in any previous recorded 

 year. 



Temora longicomis. — The highest monthly average 

 was this year in June, but the two largest individual 

 hauls were one in April (23,200 on the 24th), and one in 

 July (18,190 on the 27th). From this summer maximum 

 the numbers fall off gradually to the end of the year. 



Paracalanus parvus. — The maximum was, as usual, 

 in September, following the summer minimum, and this 

 year it was very much higher than we have had to record 

 before, the largest haul being 138,300 on September 10th. 



Acartia clausi. — The numbers were, on the whole, 

 lower than in most recent years, the largest haul being 

 only 17,400, on July 13th. There were only six hauls 

 with numbers exceeding 10,000, two in June, one in July, 



