334 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



on board ship. The " Nansen " net is the smallest of the 

 three sizes made at the Central Laboratory in 

 Christiania, and has a mouth of 35 cm. in diameter. We 

 also have on the yacht the largest size, measuring 100 cm. 

 across, but it is the smaller size that is meant when the 

 word " Nansen " alone is used in this Report. This net 

 is also closed by the action of a brass messenger running 

 down the line. 



Our Hensen and Nansen nets are both made of No. 20 

 silk, but are not strictly comparable, because of differences 

 in shape and size. As a rule the Nansen catches more 

 than the Hensen does. The two sets of catches are there- 

 fore treated separately in what follows : — 



Hea t sex Net Hauls in 20 to 10 fathoms. 



In the three years ('07-'09) our closing modification 

 of the Hensen quantitative net has been used in all 231 

 times, and of these 141 represent gatherings made 

 vertically in the zone of 20-10 faths. 



Stat. I, 5 miles off Bradda Head, is the locality where 

 the greatest number of hauls was taken in each of the 

 years (18 in '07, 28 in '08, and 26 in '09 , and where, 

 therefore, a comparison may most naturally be made. 



Station I. 





Easter. 





No. of Hauls. 



Range in cc. 



Average 

 Catch. 



1907 



12 

 11 

 19 



0-5 to 9-5 

 0-1 „ 1-3 

 0-15 „ 3-5 



3-2 



1908 



0-5 



1909 



11 







Station T. 



1907 

 1908 

 1909 



Summer. 



No. of Hauls. 



Range in cc. 



0-05 



0-1 



0-3 



to 



0-75 



1-5 



0-8 



Average 

 Catch. 



0-4 

 0-7 

 0-5 



