Willey. — Economic History of Copepods 325 



outside of the Basin of Minas, there are two, one a calanoid, 

 the other a harpacticoid, offering pecuHar and interesting fea- 

 tures. A plankton gathering taken by Mr. Leim at the surface 

 in the ebbing tide at Shubenacadie on July 31, 1919, and sub- 

 mitted to me for determination, contains 75 per cent of a har- 

 pacticoid genus named Canuella, new to Canada and differing 

 from the European species. 



All of the bays mentioned in the preceding paragraphs have 

 special hydrographic conditions and therewithal a character- 

 istic population of copeppds. Plankton studies and hydro- 

 graphical observations are thus seen to be inseparable and an 

 integral part of fishery investigation. 



