SEA-FISHERIES LABORATORY. 297 



OlKOPLEURA. 



Oikopleura dioica was, as usual, present in the Bay 

 gatherings throughout the year. The maximum haul was 

 35,060 on June 1st, but the highest monthly average was 

 in April (10,403 as against 10,099 in June), while there 

 was a depression between these two peaks in May, when 

 the monthly average was only 2,387. The numbers fell 

 in July and August, but were fairly high again in 

 September and October (10,910 on September 28th ; 

 9,500 on October 18th; 8,550 on November 3rd). On the 

 whole this record is more like that of 1912 than of 1913 ; 

 but the differences between the three are not very great. 



Various Larvae. 



Echinoderm larvae were again, as in 1913, most 

 abundant in February and in March, but the numbers 

 reached were not quite so great — 20,000 on February 26th 

 being the maximum haul at that time of year. A few 

 were present in other months, and there was a quite 

 exceptional haul of over 25,000 on June 22nd, 1914. 



Polychaet larvae were present throughout most of 

 the year, and the record was very much like that of 1913, 

 the maximum being again in spring. The largest haul in 

 1913 was 115,000 on March 3rd, and that of 1914 was 

 150,200 on March 7th. 



The " Mitraria " Polychaet larva is again seen by 

 this year's record to be a cold water form, having its 

 maximum in spring and being rare or absent in the warm 

 months of summer. The largest hauls were 2,580 on 

 January 13th, 8,200 on February 26th, 4,100 on March 

 18th, and 10,000 on April 9th. Although February and 

 April show the greatest individual hauls, March has the 

 highest monthly average (1,875 against 1,431 in February 



