INTRODUCTION 



The following symbols are used for nets, apparatus, etc. : 



B Oblique. 



BT Bathythermograph. 



DC Conical dredge. Mouth 16 in. (40-5 cm.) in diameter, with a canvas bag. 



DLH Large rectangular dredge. Heavy pattern, 4 ft. (1-2 m.) wide. 



DRS Small rectangular dredge. 



H Horizontal. 



KT Kelvin sounding tube. 



LH Hand lines. 



N 50 50 cm. silk tow net. Mouth circular 50 cm. (19-6 in.) diameter: 200 meshes to the linear inch. 



N 70 70 cm. tow net. Mouth circular, 70 cm. (27-5 in.) diameter: mesh graded, at cod end of silk, with 



74 meshes to the linear inch. 

 N 100 1 m. tow net. Mouth circular, 1 m. (3-3 ft.) diameter, stramin with 10-12 meshes to the linear inch.* 



N 100 BS Modification of the N 100 net in which the cod end of the net is turned in and drawn up part way inside 



the net. Here it is supported on bridles from the net ring. No net bucket is used, and the plankton 



is collected in the annular bag of netting. The method is described by Sheard (1941). 

 NH Hand net. 



NHP A modification of Harvey's phytoplankton net. A metal funnel (aperture 30-5 cm.) leads to a recording 



mechanism and thence to a sleeve-shaped silk net of 200 meshes to the linear inch, terminating in a 



conical bucket. The apparatus is hauled vertically at approximately iom.a minute, and the mechanism 



records the volume of water filtered. 

 OTL Otter trawl. Head rope 40 ft. (12-2 m.) long: mesh at cod end ii in. (3-2 cm.). 



Sh. Coll. Shore collecting. 



STK Kullenberg piston core sampler. 30 ft. (9-1 m.) effective length. 



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. 

 V Vertical. 



XSR Seismic reflection shooting. An explosive charge is detonated on the sea surface and the reflected 



sound waves recorded. 



The net hauls at Stations 2706-2725 are marked with a +. The plankton catches from those hauls 

 are in the possession of the Division of Fisheries of the Council for Scientific and Industrial Research, 

 Australia. 



The addition of the symbols B, H or V to those used for tow nets, indicates whether they were 

 hauled obliquely, horizontally or vertically. Where the depth interval indicates that a net fished 

 vertically was closed, this was effected on the Nansen principle. The maximum depths reached by 

 horizontal and oblique nets were determined where possible by the use of Kelvin Sounding Tubes 

 and this is recorded by the insertion of the symbol KT in the ' Remarks ' column. 



Soundings taken by the echo-sounding machine are marked with an asterisk. 



At the end of the list (p. 398) will be found a summary of the stations with references to the charts 

 (Plates III-V) on which the station positions are marked. 



REFERENCES 



Armstrong, F. A. J., 1951. The determination of silicate in sea water. J. Mar. biol. Ass. U.K., xxx, pp. 149-60. 



Harvey, H. W., 1934. Measurement of phytoplankton population. J. Mar. biol. Ass. U.K., xix, pp. 761-74. 



Harvey, H. W., 1948. The estimation of phosphate and of total phosphorus in sea waters. J. Mar. biol. Ass. U.K., xxvn, 



PP- 337-59- 



Kullenberg, B., 1947. The piston core sampler. Svenska hydrogr.-biol. Komm. Skr. Bd. 1, Hft. 2, pp. 1-46. 

 Sheard, K., 1941. Improved methods of collecting marine organisms. Rec. S. Aust. Mus., vn, No. 1, pp. 11-14. 



* Earlier versions of the N 100 were of graded mesh. 



302 



