Contents- 



Page 



I. Introdu etion 3 



II. Structure and growth of the Zostera 5 



1. The leaf-bearing sboots 



2. The flowerbearing shoots. 



III. The outer conditions for the growth of the Zostera 17 



1. .Sahnity of the water. 



2. Shelter. 



3. Light. 



4. Nature of the bottom. 



IV. Distribution of the Zostera in Danish water g 25 



1. West coast of Jutland. 



2. Lim Fjord. 



3. Kattegat. 



4. Tlie waters between .Jutland and Samso inchiding Aarlius Bay. 



5. Little Belt. 



6. Odense Fjord. 



7. Samsø Belt. 



8. Great Belt and Langeland Belt. 

 i). North coast of Zealand. 



10. Ise Fjord. 



11. The Sound. 



12. Smaahxnd Waters. 



13. Guldborgsund. 



14. Gronsund, Ulvsund and Bøgestroni. 



15. The Baltic (Danish Shores). 



V. The Zostera Vegetation as a habitat for othcr piants and for animals.... 33 



1. The pure Sand-Zostera Vegetation. 



2. The pure IMud-Zostera Vegetation. 



3. Red-Alga Zostera Vegetation. 



4. The Brackish-Water or Green-Alga Zostera Vegetation. 



VI. Dead weed 37 



1 West coast of Jutland. 



2. Lim Fjord. 



3. Kattegat. 



4. Little Belt. 



5. Great Belt and Langeland Belt. 

 The remaining waters. 



VII. Other marine Phanerogams '. 39 



1. Zostera iiana. 



2. Ruppia maritima. 



3. Zannichellia palustris. 



4. Potamoijeton pectinatus. 



VIII. Table of measurements of the length and breadth of the leaf, and of the 



length of the flowering shoots 42 



IX. The material collected and o b serv ed 47 



