PREFACE. 



In presenting the following remarks to the pubhc, I 

 by no means intend to affirm that more information 

 on many points may not be obtained than is con- 

 tained in the present work : as far as these go, they 

 are generally the results of my own observations 

 on the coasts of England, Ireland, Scotland, Isle of 

 Man, and Wales ; I wish I could also say, that I had 

 had more experience on the Channel beds. I have 

 also received information from numerous friends 

 regarding other localities, verifying, or otherwise, my 

 own observations. The Chapter on Reproduction is 



entirely from my own observations, obtained with 



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