ko. 1758. ON MARINE COPEPODA AND GLADOCERA. -8HARPE. 409 



17. Family CORYGEID.E. 



40. Genus ( 'oryca us. 



56. ( '. ' longatus Claus, Gulf Stream 70 miles south of Marthas Vineyard, July 



Wheeler). 



57. C. carinatus Giesbrecht, as above (Wheeler). 



41 . < ienus Sapphirina. 



58. v g< mum Dana, Gulf Stream south of Marthas Vineyard, July (Wheeler), 

 is. Family [LYOPSYLLIDjE. 



42. Genus Tlyopsyllus. 



59. /. sarsi Sharpe, harbors and brackish ponds, Woods Hole, Massachusetts. 



60. I. natans Williams, Wickford and Charlestown Pond, Rhode Island, sum- 



mer (Williams). 



Order CLADOCERA. 

 Division GYMISOMERA. 



Tribe 0NYCH0P0DA. 



1. Family POLYPHEMID/E. 



1. Genus I'odon. 



1. P. Uucharti (G. 0. Sars), surface tows off Bureau of Fisheries wharf, Woods 



Hole, Massachusetts, July to November. 



2. Genus Evadm . 



2. E. nordmanni Loven, Narragansett Ray, Rhode Island, summer (Williams) ; 



surface tows off Bureau of Fisheries wharf, Woods Hole, Massachusetts, 

 August to November. 



ANNOTATED LIST. 

 Order COPEPODA. 



Tribe GYMN0PLEA. 



Family CALANID^E. 



Genus CALANUS Leach, 1819. 



CALANUS FINMARCHICUS (Gunnerus). 



Calanus Jinmarchicus (i. 0. Sars, Crustacea of Norway, Calanoida, vol. 4, 1903, 

 ,,.!», pis. 1, 2, 3, 22 figs. 



Length. — Female, 2.7 to 5.4 mm; male, 2.. '55 to o.G mm. 



Said to be our commonest North Atlantic and Arctic Copepod. 

 Sars speaks of it as being "eagerly devoured by our common food 

 fishes, as the herring and mackerel." Prof. Robert Collett states that 

 it forms the almost exclusive food of one of the great whales, Bah nop- 

 t( id borealis. 



Their great abundance in northern waters would seem to bear out 

 the genera] rule that "the nearer the cold zone, the smaller the num- 

 ber of species, but the larger the number of individuals of the species." 



