PARASITIC WORMS 



WITH A NOTE ON A FREE-LIVING NEMATODE. 



BY 



R. T. LEIPER, D.Sc, 



Helminthologist to the London School of Tropical Medicine, 

 AND 



SURGEON E. L. ATKINSON, R.N., 



Parasitologist to the British Antarctic ("Terra Nova") Expedition, 1910. 



CONTENTS 



Introductory 

 Nematoda . 

 Acanthocephala 

 Trematoda . 

 Cestoda 

 Summary and Conclusions 

 Literature . 



PAGE 



] 9 

 23 

 30 

 34 

 39 

 57 

 60 



INTRODUCTORY. 



The material, comprising- in all thirty-eight species, was obtained chiefly within the 

 Antarctic Circle. A certain amount of collecting was done, however, during the outward 

 voyage of the " Terra Nova." A preliminary account is given, therefore, of the various 

 forms and their hosts according to the geographical regions in which they were found. 



Tropical Zone. — On July 3rd and 4th, 1910, when the "Terra Nova " was in 

 Lat. 22° 28' N., Long. 23° 05' W. (Stat, 23), and Lat. 20° 47' N., Long. 24° 06' W. 

 (Stat. 25), two flying fish came aboard. From the contents of the alimentary canal of 

 one a few Trematodes were obtained. In the gall-bladder of the other, a fluke, 

 apparently a form of Polystomum, was found. Of these specimens only unrecognizahie 

 fragments remain, so that no description of them is given. The flying fish were 

 Exocoetus spilopus. On the 27th July, 1910, the "Terra, Nova " arrived at S. Trinidad, 

 a, desert island in the South Atlantic in Lat. 20° 28' S., Long. 29° 25' W. (Stat, 36. 37). 



F 



