sary to anchor itself to the organ wall. Large 

 samples of swordfish intestines and rectums will in- 

 variably show many variations in the pseudoscolex 

 structure of F. plicatus. 



Acknowledgments 



We thank L. S. Uhazy for initiating the study of 

 these parasites, C. lies for comments on the manu- 

 script, P. W. G. McMullon for advice on figures, and 

 B. Garnett for preparing the typescript. 



Literature Cited 



Cooper, A. R. 



1918. North American pseudophyllidean cestodes from fishes. 

 III. Biol. Monogr. 4:1-243. 

 Iles, C. 



1970. A preliminary investigation of the parasites of the gills 

 and gastrointestinal tract of the swordfish Xiphias gladius 

 L. from the Northwest Atlantic. J. Fish. Res. Board Can. 

 MS Rep. Ser. 1092, 11 p. 

 Linton, E. 



1901. Parasites of fishes of the Woods Hole region. Bull. 

 U.S. Fish. Comm. 19:405-492. 

 Nigrelli, R. F. 



1938. Parasites of the swordfish, Xiphias gladius Linnaeus. 

 Am. Mus. Novit. 996:1-16. 

 Yamaguti, S. 



1959. Systema helminthum. Vol. 2. The cestodes of verte- 

 brates. Intersci. Publ., N.Y., 860 p. 



W. E. Hogans 



Identification Centre 



Department of Fisheries and Oceans 



Biological Station 



St. Andrews, Nova Scotia E0G 2X0, Canada 



Marine Fish Division 



Bedford Institute of Oceanograph 



Department of Fisheries and Oceans 



P.O. Box 1006 



Dartmouth, Nova Scotia B2Y JfA2, Canada 



P. C. F. Hurley 



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