SEA-FISHERIES LABORATORY. 213 



hauls are 20,000 on June 3rd, and 17,900 on July 4tli. 

 Temora, with the same distribution throughout the year, 

 was more abundant in 1910 and had its maximum at the 

 end of July. 



Paracalanus parvus. — Last year's remarks in regard 

 to this species apply again. The maximum is again in 

 September, and the largest hauls are 61,930 on August 

 24th, and 32,390 on September 29th. 



Acartia clausi. — This species again only reaches high 

 numbers in summer, and this year has its maximum in 

 August — the only really large hauls were 59,360 on 

 August 24th and 42,380 on October 19th. 



Anomalocera patersoni. — This oceanic form was 

 exceptionally rare at Port Erin in 1911, and was absent 

 during most months of the year. A few stray individuals 

 were present in June and July. 



Centrofages hamatus. — This is a summer form 

 appearing in April, becoming more abundant in May, 

 with a low maximum in June, and then dwindling 

 gradually to September. 



Microcalanus pusiUus. — Last year's record again 

 holds good for this species. The maximum in 1911 is in 

 December, and the minimum in July, August and 

 September. 



Amongst other rarer Copepoda, Euferpina acutifrons 

 is a winter form which occurred in fair quantity in 

 November, December and January, and in no other 

 month. Isias clavipes occurred in May, June, August, 

 September and October, the two largest hauls being 130 

 on May 13th, and 156 on >September 13th. 



Omitting these latter, rarer, species, the monthly 

 average hauls in Port Erin Bay for the above nine, more 

 important, species of Copepoda are as follows : — 



