On the Ecology and Distribution of 



tlic Grass-Wrack (Zostera marina) 



in Danish AVaters. 



Motto : It is certainly Ihis plant whicli for a 

 great part conditious the fish-wealth of 

 our coasls. 



(Dr. C. G. Joh. Petersen in Beretning fra den 

 danske Biologiske Station I, p. 168) 



(With 9 figures.) 



By 

 Dr. C. H. Ostenfeld. 



