SEA-FISHERIES LABORATORY. 



287 



curves a certain amount of similarity in the distribution 

 throughout the year becomes evident (see fig. 7). 



In all three cases the maxima are in the summer six 

 months, May to October inclusive. In all three cases there 

 are two well-marked maxima, the apices of which (taking 

 monthly averages) are in July and September respectively 

 in the case of the Nauplii and the juveniles, and in August 

 and October in the case of the adults. The curve for the 

 juveniles is very like that of the Nauplii, but has much 



Fig. 7. Curves showing distribution of Copepoda (Ad, adults 

 Juv., young ; N, Nauplii) in 1909. 



less elevated peaks. The Nauplii show (on the monthly 

 averages) an extensive maximum from the middle of May 

 till the middle of July, with numbers ranging from 

 18,000 to 24,000 per haul. The curve for the juveniles 

 only reaches about 12,000, and that only for a short time 

 in July. Then the Nauplii curve shows the second 

 maximum in the middle of September, reaching close on 

 20,000; while the curve for the juveniles shows that at 

 that same time of year they scarcely reached 10,000 per 

 net. 



The curve for the adult Copepoda differs a little in 

 T 



