19 



PARASITIC WORMS 



WITH A NOTE ON A FREE-LIVING NEMATODE. 



BY 



R. T. LEIPER, D.Sc., 



Helmmthologist to the London School of Tropical Medicine, 

 AND 



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



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



. 



CON T K X T S 



Introductory 



Nclliatoda . 



Acaiithocephala 



Trematoda . 



Cestoda 



Siiiiinuiry ami ( lonclusions 



Literature . 



r.utE 



L9 



23 

 30 

 34 

 39 

 57 

 60 



INTRODUCTORY. 



'I'll- mail-rial, comprising iii all thirty-eight species. \vas obtained chiefly within the 

 Antarctic t 'in-lr. A certain aiuniint of collecting was done, however, during the outward 

 voyage ol'ihc "Terra Nova." A preliminarv account is given, therefore, of the various 

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



'/'/v/'/'W Zone. On .Inlv .".I'd and 4th. HMO. when the "Terra Nova " was in 

 bit. -1-1 28' N., Kong. 23 05' W. (Stat. 23), and Lit. _'<) 47' N.. Long. i.'4 0(i' W. 

 (Stat. _'.">). two Hying tish came aboard. From the contents of the alimentary canal of 

 one a few Trematodes wen- obtained. In the gall-bladder of the- other, a Hiike. 

 apparently a form of Polystomum, was found, of these specimens only unrecognizable 

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

 ExoCCBtUS spilopus. On tin- -J7th -Inly. I'.HO. the "Terra Nova " arrived at S. Trinidad, 

 a desert island in the Soiilh Atlantic in I.al. _'() -js' S.. Long. L".I 25' W. (Stat. :!(!. 37). 



F 



