20 



ae 



SURFACE 



CURRENT 



10 



OCCASIONAL ESSS AMONO 

 INTERSTICES OF GRAVEL 



VERY FEW EOOS 

 AMONG SURFACE PARTICLES 



^BULK OF DEVELOPING EOOS 

 IN THIS ZONE 



B 



SURFACE 



24 



39 



CURRENT 



SOME EOOS IN DEEPER 

 LAYERS OF GRAVEL 



NO EGGS PRESENT 



O^^ J^t^^ 



OCCASIONAL EOOS AMONG 

 SURFACE PARTICLES 



18 



^BULK OF DEVELOPING EGGS 

 IN THIS ZONE 



BANK 



Figure 32.— Diagrammatic sketches of the distribution in depth and 

 area of the eggs in some typical sea lamprey nests. 



- 100 - 



