6 CONTENTS. 



Section I. — Physical and zoological — Continued. Page. 



Chapter V. Theoretical considerations 170 



1. Factors determining distribution 170 



2. The local fauna as influenced by the character of the bottom 171 



3. The influence of temperature 174 



4. The influence of depth 178 



5. Position of the local fauna in zoogeography 181 



6. Comparative distributions of closely related species 185 



7. Changes in the composition of the local fauna 190 



8. Conclusion 192 



Bibliography for section 1 193 



Description of dredging stations occupied during the present Survey 201 



Charts 1-227 2I 9 



Section II. — Botanical. By Bradley Moore Davis 443 



Chapter I. Introduction 443 



II. Some factors affecting the distribution of algae at Woods Hole and vicinity 445 



1. The coast 445 



2. The bottom in deeper water 445 



3. The tides and tidal currents 446 



4. The effect of ice 446 



5. Depth of water 447 



6. Light 448 



7. Temperature and seasonal changes 449 



8. Salinity of the water 452 



III. Characteristic algal associations and formations at Woods Hole and in Buzzards 



Bay and Vineyard Sound 453 



Algal associations 456 



The cool-water sublittoral formation 468 



The warm-water sublittoral formation 470 



The Zostera formation 472 



A winter sublittoral formation 473 



The littoral formations 474 



The plankton 475 



IV. A report on the algae of Spindle Rocks, Woods Hole Harbor 476 



V. The distribution of marine algae in the deeper waters of Buzzards Bay and 



Vineyard Sound 480 



1. The middle regions of Buzzard's Bay 480 



2. The middle regions of Vineyard Sound 482 



3. Certain inshore regions of particular interest 487 



4. Some statistics relative to the distribution of algae in Buzzards Bay and 



Vineyard Sound 494 



Literature cited for Section II 497 



Charts 228-274 498 



