SEA-F ESHEBIES LABOB ATOB Y 



275 



their disappearance on April 26th. None were taken at 

 any other time of the year. The " Cypris " stage follows 

 on after the Nauplius. It is first taken in the bay on 

 April 6th, rises to its maximum on the same day with the 

 Nauplii, and was last caught on May 24th. Figure 12 







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Fig. 12. 

 shows the curves for these two successive larval stages. 

 It will be noticed how the " Cypris " curve keeps below 

 that of the Nauplius, the maxima being 1,740 and 10,500 

 respectively. Probably the difference between the two 

 curves represents the death-rate of the Balani during the 

 Xauplius stage. 



Sagitta in Bay. 



The numbers of Sagitta bipwietata obtained in the 

 bay catches throughout the year run as follows per haul : 

 —Jan., 8; Feb., 1; Mar., 1; Apr., 8, 7, 24, 15, 20, 45, 

 15, 7, 61, 39, 20, 5, 4 ; May, 6, 100, 20 ; June, 95, 30, 15 ; 

 July, 3, 35, 40, 425 ; Aug., 75, 100, 1,000, 200, 600, 1,800, 

 800, 700, 8, 54, 65, 63, 76; Sept., 16, 10, 40, 20, 20, 3, 

 26, 70, 50, 100, 10, 32, 50, 10; Oct., 5, 10, 190, 90; 

 Xov., 324, 56, 1; Dec, 1, 8, 50. Fig. 13 shows the 



