INTRODUCTION. 



No other portion of the British Islands has been worked by 

 so many students interested in Carcinology as onr two South- 

 western Counties. Montagu, and Leach, with his friends who 

 collected for him; Jonathan and R. Q. Couch; that excellent 

 naturalist F. W. P. Cocks ; and, in more recent years, Spence 

 Bate, Parfitt, Stebbing, Beaumont, Grarstang, and Bassett- 

 Smith, with many others, have from time to time added to our 

 knowledge of the Crustacean Fauna. Nevertheless additions 



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have been made during the last few years even among the 

 Podophthalma ; and after the publication of this volume, 

 wdiich very considerably extends our knowledge of the lower 

 Orders, much will still remain to reward future workers, 

 especially from dredging in 20 to 40 fathoms, where un- 

 doubtedly large numbers of Sympoda, Isopoda, Amphipoda, 

 Ostracoda, and Copepoda may yet be found. 



Little dredo'ino- has been carried out with a view to these 



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smaller Crustacea beyond the Laminarian zone. Dr. Norman 

 went to the Biological Station at Plymouth, in August 11)03, 

 for the express purpose of working in the deeper water, but, 

 unfortunately the month was extraordinarily temptestuous 

 for the time of year ; and in consequence of this and of the 

 steamer's absence for part of the time on the work of the 

 " International Fisheries Investigation Committee," on only 

 one occasion was he able to get out as far as the Eddy.stone 

 Lighthouse, and even on that day the weather was far from 



