Report on the Parasitic Copepoda collected during 

 the Canadian Arctic Expedition, 1913-18. 



By CHARLES BRANCH WILSON, D.Sc., PH.D. 



State Normal School, Westfield, Massachusetts. 



While the parasitic copepods collected by Mr. Frits Johansen during the 

 Canadian Arctic Expedition do not include any forms new to science, they are 

 still of peculiar scientific interest for two reasons. The first of these has already 

 been stated in connection with both the fresh-water copepods and the free 

 swimming marine forms, namely the fact that they were collected in a region 

 hitherto practically unexplored for such crustaceans. 



The present author has reported a few species collected by Alaskan and 

 Siberian fishermen and presented to the United States National Museum; but 

 they were nearly all marine forms and included only a few straggling specimens 

 from the Salmonidae that spawn in fresh water. 



The present collection supplements these in a very decisive manner and 

 indicates that the genus Salmincola is as well represented in the polar as in 

 temperate regions. In fact we are now justified in concluding that these 

 crustacean parasites are as widely distributed as their fish hosts, and wherever 

 the hosts are found we may well expect to discover also the copepods which 

 infest them. 



LERNAEOPODID^E. 

 Salmincola gibber (Wilson). 



From mouth of salmon, Port Clarence, Alaska, Station 20 d. 

 From tongue and gills of Salvelinus malma at Bernard harbour, Dolphin 



and Union strait, Northwest Territories, Station 41 v. 



From mouth of Salvelinus malma, Bernard harbour, Dolphin and Union 

 strait, Northwest Territories, Station 49 p. 



Salmincola siscowet (Smith). ' 



From tips of gill filaments of Salvelinus malma at Bernard harbour, North- 

 west Territories, Station 37 h. 



Same host and locality, but Station 37 v (lake). 



From tips of gill filaments of Cristivomer namaycush at Bernard harbour, 

 Northwest Territories, Station 40 / (lake). 



Same host and locality, but Station 40 g. 



Same host and locality, but Station 40 i. 



From tailfin of Cristivomer namaycush at Bernard harbour, Northwest 

 Territories, Station 40 o (lake). 



Salmincola falculata (Wilson). 



From mouth of Salvelinus malma at Bernard harbour, Northwest Territories, 

 Station 37 v (lake). 



Same host and locality, but Station 49 m (Dolphin and Union strait, North- 

 west Territories). 



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