SEA-FISHERIES LABORATORY. 217 



Sagitta. 



This " Panthalassic " species (S. bipunctata) , usually 

 considered to be an oceanic form, was again present in 

 Port Erin Bay in every month, with the maximum in 

 summer (June), and a secondary increase in late autumn 

 (November). It became more abundant in November after 

 stormy weather had set in. 



The monthly average hauls are as follows : — 



Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. 

 9 22 7 7 66 244 64 30 15 28 59 9 



The largest hauls are 206 on May 29th, 620 on 

 June 1st, 1,300 on June 3rd, 250 on June 15th, and 412 

 on November 24th. 



A haul of the shear-net five miles off land, at about 

 10 fathoms, on April 14th, gave 301 large specimens of 

 Sagitta, although the surface nets worked at the same 

 time caught none, and the medium Nansen hauled 

 vertically from 20 fathoms showed only 4. This result 

 suggests that at that time although not present at the 

 surface Sagitta was abundant a few fathoms below. 



OlKOPLEURA. 



This form {O. dioica) has again the same sort of 

 distribution curve throughout the year. It is present in 

 every month, but the monthly average hauls only run to 

 thousands from May to October, inclusive. The largest 

 hauls are over 34,000 on May 1st, and over 15,000 on 

 October 19th. 



Various Larvae. 



Cirripede nauplii and other Larva] forms do not show 

 anything very striking in their distribution this year, 

 and so do not call for individual treatment. It will 



