vi TEMPORARY PREFACE. 



A grant of £50 was made by the Royal Society in aid of the coloured plates, and 

 the same amount by the Carnegie Trust, who also generously contributed to the original 

 artistic work carried on at the Marine Laboratory. 



To Mr. Hopkinson, the Secretary of the Society, I am much indebted for constant 

 advice and attention, especially in connection with blanks in the references. The trouble 

 he cheerfully took to render these references as complete as possible, as well as the 

 labour devoted to the proof-sheets and index, deserves my cordial acknowledgments. 



W. C. M. 



Gatty Marine Laboratory, 

 St. Andrews ; 

 November, 1914. 



