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Some Points on the General Anatomy of Gyrocotyle, 



By 



Henry B. Ward. 



Contributions from the Zoological Laboratory, University of Illinois, 



No. 12. 



With plate 32. 



During a scientific trip to southeastern Alaska, in 1906, I exa- 

 mined designedly some specimeos of a local Chimaeroid fish, Hydro- 

 lagus collei, the rat fish common in those waters at moderate depths. 

 In them I had the good fortune to find a number of specimens of an 

 interesting parasite flatworm, Gyrocotyle, which I was anxious to 

 study because of its peculiar morphological and systematic relation- 

 ships to both Trematoda and Cestoda. The amount of material of 

 this species which I secured at that time was not large and I 

 endeavored to Supplement it on the occasion of a second visit to 

 the same region in 1909 with but indifferent results owing to 

 various circumstances. x ) A study of the material secured in these 

 trips formed the basis of a paper read at the meeting of the 



1) The primary object of my trips was the study of the Alaska 

 salmon for the U. S. Bureau of Fisheries, and other items could receive 

 only incidental attention. I am indebted to Hon. Geoege M. Bowers, 

 TL S. Commissioner of Fish and Fisheries, for perinission to use these 

 results. 



