148 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



10 or so at most for any locality, and they only cover a 

 few months, while many of the samples taken on the fish- 

 egg cruises, being taken with a specially coarse net, 

 contain little general plankton. Hence I have mot thought 

 it necessary to give tables of the gatherings from these 

 localities. 



The course of events at Station 14 may be seen in 

 Table I. The Diatoms show three maxima, one in May 

 and another in October consisting mainly of Biddulphia 

 and Chaetoceras, separated by a maximum of Guinardia 

 and Rhizosolenia in July. The species of Chaetoceras in 

 the two maxima differ; Ch. didymam and Ch. teres only 

 occur in spring, while Ch. debile seems to have been more 

 abundant in spring than in autumn. On the other hand, 

 Ch. boreale, Ch. contortum, and Ch. schuttii only occur in 

 autumn, while Ch. decipiens was more abundant in 

 autumn than in spring. (It is hardly necessary to say 

 that such quarterly observations as these must be used 

 cautiously, and too much reliance must not be placed upon 

 their records in trying to interpret the changes in the 

 plankton.) Eucampia only occurs in autumn, and in fair 

 numbers; Ditylium is only absent in summer, but only 

 occurs in any quantity in autumn. 



Ceratium is present throughout the year, though 

 scarce in May. There is no very distinct maximum 

 shown, though the rather higher numbers in October may 

 be the end of the autumn maximum. The zooplankton is 

 most marked in July; this is the only haul in which 

 C alarms occurs in any quantity, while Temora is not 

 represented in the other months. 



The results of the observations at Stations 5, 6, and 7 

 are shown in Table II. Here the course of events appears 

 to have been rather different. There is a well-marked 

 Chaetoceras maximum in June, most conspicuous at 



