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On Rock Remains in the Bed of the 

 English Channel. 



An Account of the Dredgings carried out by 

 ss. "Oithona" in 1906. 



By 

 L. R. Crawshay, M.A. 



Assistant Naturalist at tlie Plymouth Laboratory. 

 JVith one Chart (Plate V) and two Figures in the Text. 



In the programme of work for the summer of 1906, it was decided by 

 the Director that a series of cruises should be carried out by the 

 Association's steamer Oithona to investigate the fauna of the deeper 

 waters of the English Channel. The bearing S.W. \ S., Magnetic, = S. 

 23° W., True,* from the Eddystone Lighthouse was chosen as a base- 

 line, and the work was to be carried out with special reference to 

 points at 10-mile intervals along this bearing. The fauna was to be 

 investigated as fully as possible, and bottom-deposits, particularly 

 stones, were at the same time to be carefully recorded and collected. 

 In all, eight cruises were made, the work being extended nearly as 

 far as the 50-mile point. 



Pending the completion of the report on the fauna collected, it has 

 been decided to issue in a separate form an account of the geological 

 collections that were made, which afford valuable evidence in the light 

 they throw on the history of the Channel. 



The stones, with which Mr. Worth's report deals copiously in a 

 subsequent paper, were first found on June 11th at the close of the 

 second cruise at Position (9), bearing S. 31° W. from the Eddystone, 

 22 miles, and at a depth of about 40 fathoms. The 3' 0" dredge 

 was cast to try the nature of the bottom. After an unsatisfactory 



* Except where otherwise stated, all hearings here given are true, a variation of 

 16' 45' W. (say 17° W. ) having been allowed throughout. 



