SEA-FISHERIES LABORATORY. 



209 



have been described. The other common species, 

 C. fusus and C. furca, are also present, although they are 

 not so abundant as C. tripos. 



Under Peridininm, in these reports in the past, we 

 have united several different forms, and we do so again 

 in the table above and the one that follows to preserve 

 continuity ; but we shall give a further statement below 

 as to the sab-genera and species of Peridinium that occur 

 in our material. 



Looking at the figures from which the table of 

 monthly averages has been compiled, we find that the 

 numbers in the case of both Ceratiuin and PeridiniuTn 

 begin to get larger towards the end of May, and reach 

 their highest in June and early July. At that time of 

 year (end of May and June), also, we find that all the 

 common species are represented in all the nets used, as 

 the following record of two adjacent hauls demonstrates : 



Species recorded 

 Ceratium furca ... 



„ fusus ... 



„ tripos... 

 Peridinium spp. 



Vertical. 

 2,000 

 1,.500 

 2,000 

 2,500 



Although the above are representative hauls, they 

 are none of them very large ones. We add the following 

 records of greater numbers of C. tripos taken in single 

 hauls : — 



June 19th, fine net 30,000 



„ 30th, „ 30,000 



30th, coarse net 36,400 



July loth, „ 76,600 



Sept. 8th, „ 57,000 



