SEA-FISHERIES LABORATORY. 383 



10,500 on March 28th). They are characteristically 

 winter and spring forms, present in abundance when the 

 water is at its coldest. 



Crab Zoeas occurred in the usual small quantities 

 from February to September. Two hauls only had 

 numbers exceeding a hundred, namely, those on 

 March 30th and July 31st, with 161 and 178 respectively. 

 The highest monthly average was 40 in March. However, 

 we know from former experience that it is largely a matter 

 of accident whether or not our nets encounter a swarm of 

 Crab Zoeas — some of the swarms being of very small extent 

 but densely crowded with larvae. 



Mr. H. G. Jackson is making a special study of the 

 larvae of Higher Crustacea (Crabs, Lobsters, &c.) in our 

 gatherings, and will furnish a separate report upon these. 



Balanus nauplii were present for the first time on 

 January 25th (1,840), and were in every haul (except one) 

 from that date to June 5th ; their final appearance was on 

 June 24th. The maximum was reached on March 26th, 

 with 453,720, the average for the month being 61,394. 

 The next highest record was 255,000 on February 13th. 

 Of the " Cypris " stage very few indeed were present, the 

 numbers ranging from one to seven (with two exceptions 

 of 20 and 23 on May 20th and 23rd), from the middle 

 of April till early in July. 



Gastropod larvae were represented in every month in 

 1913. The highest monthly average was 1,537 for March, 

 and the highest records 3,520 on March 20th, and 3,300 on 

 November 29th. 



Lamellibranch larvae were more abundant than 

 Gastropods, and were present in nearly all of the standard 

 hauls taken during the year. Some of the chief hauls 

 were as follows:— 19,000 on May 20th, 20,000 on 

 June 11th, 13,100 on June 24th, 10,000 on July 17th, 



