UNEVENNESS OF OCEANIC PLANKTON 



5i5 



known from the ship's log, so that the mileage represented by each section on the silk 

 may be determined. After the completion of a run the roll is taken out, placed on a 

 special microscope substage and examined section by section. 



The observations made will now each be described briefly in turn, a general dis- 

 cussion on the comparisons and contrasts between different records being reserved till 

 the end. 



Fig. 1. Chart showing the positions of the lines along which continuous plankton records were obtained on the 1925-27 

 voyages of the R.R.S. 'Discovery' and the R.R.S. 'William Scoresby'. The arrows indicate the direction and length of each 

 record and are numbered in reference to the record numbers in the text. The position of the consecutive net series, WS 

 133, described on p. 535, is also shown. 



OBSERVATIONS 

 Record i 



Date: 25. xi. 25. 



Time: 0920- 1700. 



Position: 20 25' S, 17° 10' W to 21° 09' S, 16° 54' W. 



Distance by ship's log: 41-4 miles. 



The plankton was very poor in quantity and comparatively even in its distribution. 

 Small Medusae, Chaetognatha, Polychaeta, the gastropod Ianthina, Amphipoda, 

 decapod larvae, Lucifer, and postlarval fish occurred in isolated ones and twos along the 



