Figure l. — Basic design of the nektomc subsampler; see text for explanation. 



tion shown, the three vanes subdivide the 

 sample into portions approximating 0.2, 0.2, 

 and 0.6 of the total. 

 9. False floor consisting of three sections bonded 

 to the inside of the outer cylinder (3) at a 

 height so that the upper surface is exactly 

 even with the upper edges of the vanes when 

 (6) is lowered to the base. The vanes move up 

 and down through the slits left between the 

 sections of the false floor. Enough space must 

 be left between the inner edges of the false 

 floor and the inner cylinder (6) and its at- 

 tached vanes to allow the inner cylinder and 

 vanes to move freely up and down. Con- 

 versely, the clearance must be small enough 



to prevent organisms from falling into the 

 space below the false floor. Omitted from the 

 diagram are braces extending from the base to 

 near the inner edges of the two smaller sec- 

 tions of false floor. 



10. Hinged door for removing subsampled or- 

 ganisms. 



11. Latch holding the other door closed. 



12. One side of a spout into which the water and 

 organisms pour when doors are opened; the 

 organisms are collected in a sieve below the 

 spout. 



13. Rubber tubes to carry water; the middle one 

 enters the cylinder (3) beneath the false floor 

 (9). 



491 



