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THE AMERICAN NATURALIST [Vol. XL 



1864. Calanus finmarchicus Boeck. 

 1878. Calanus finmarchicus Brady. 

 1892. Calanus finmarchicus Giesbrecht. 

 1903. Calanus finmarchicus Sars. 



This is a species widely distributed in the North Atlantic and 

 Arctic Oceans, having been taken by Nansen's expedition above 

 85° north latitude. It has been twice reported from American 

 waters, by Thompson and Scott ('98) and by Wheeler (:00). It 

 appeared abundantly in tows taken in Narragansett Bay in Janu- 

 ary but was found at no other time. The specimens agree with 

 those taken by Wheeler in lacking the marked concavity of the 

 inner border of the basal joint of the fifth pair of legs of the female. 



Pseudocalanus elongatus (Boeck) 



1864. Clausia elongata Boeck. 



1878. Pseudocalanus ehmjatus Brady. 



1892. Pseudocalanus elongatus Giesbrecht. 



1898. Pseudocalanus elongatus Thompson and Scott. 



Narragansett Bay, January, February. This is a decidedly 

 northern form, its southern European limit being the northern 

 coast of France. 



Centropages hamatus (Lilljeborg) 



185.3. Ichthyophorba hamata Lilljeborg. 



1863. Ichthyophorba angustata Claus. 



1864. Centropages hamatus Boeck. 

 1892. Centropages hamatus Giesbrecht 



1898. Centropages hamatus Thompson and Scott. 

 1900. Centropages hamatus Wheeler. 

 1903. Centropages hamatu>< Sars. 



Narragansett Bay, January. Ft-hruary. Wickford, summer. 



1890. SchmarhoL PopiH- and.). Uirhurd. 

 1894. Heterocnlanus T. Scctt. 

 1894. Weismannelln Dahl. 



