INT;RODUCTION 



N 100 I m. tow-net. Mouth circular, i m. (3-3 ft.) diameter: mesh graded, at cod-end of stramin, with 10-12 



meshes to the hnear inch. 



NH Hand net. , , r r, j 



NHP A modification of Harvey's phytoplankton net.^ The apparatus measures the volume of water hltered 



through a small sleeve-shaped silk net of 200 meshes to the linear inch. 

 OTC Commercial otter trawl. Head rope 80 ft. (24-5 m.) long: mesh at cod-end i,\ in. (3-8 cm.). 



TYF Young fish trawl. A bag of stramin, with 10-12 meshes to the linear inch, attached to a circular frame 2 m. 



(6-6 ft.) in diameter. With bucket at cod-end. 

 V Vertical. 



To the symbols for tow-nets (N 100, N 70, N 50 and TYF) B, H or V is always added to indicate 

 whether the haul was made obliquely, horizontally or vertically. For determining the depths of hori- 

 zontal and oblique nets, Kelvin sounding tubes were used. Their use is indicated by the appropriate 

 symbol in the ' Remarks ' column ; where the tube failed to register the depth was estimated and is 

 noted as such. When the depth of termination of an oblique haul is written (-0) it should be understood 

 that the net failed to close at some intended intermediate depth and fished all the way to the surface. 



At the end of the list (p. 280) will be found a Summary of the Stations made by the R.R.S. ' William 

 Scoresby' from April 1931 to February 1938, with references to the charts (Plates XXXIV-XXXVII) 

 on which the station positions are marked. 



1 See Harvey, H. W., 1934, Measuremeiit of Phytoplankton population, Joum. Mar. Biol. Assoc, N.S. xix, pp. 761-73. 



146 



