PARASITOLOGICAL TERMS 



lytica (Figs. la, ib), Endolimax nana (Figs. 3a, 3b), 

 lodamceba williamsi (Figs. 4a, 4b), and Dientamosha 

 fragilis (Fig. 6) in the large intestine. 



The Class Mastigophora contains seven species of 

 "intestinal" flagellates, Giardia lamhlia (Figs. 13a, 13b), 

 an inhabitant of the duodenum; Chilomastix mesnili 

 (Figs. loa, lob), Embadomonas intestinalis (Figs, iia, 

 lib), Tricercomonas intestinalis (Figs. 12a, 12b), Tri- 

 chomonas hominis (Fig. 9), which live in the large intes- 

 tine; T. huccalis (Fig. 8), an inhabitant of the mouth; 

 and T. vaginalis (Fig. 7) which occurs in the vagina. 



The Class Sporozoa is represented by one species of 

 coccidium, Isospora hominis (Fig. 15) which penetrates 

 the intestinal epithelium. Eimeria wenyoni (Fig. 16) and 

 Eimeria oxyspora (Fig. 17), which were named by Do- 

 bell as human species, have been shown by Thomson and 

 Robertson (1926a) to be E. dupe arum and E. sardince 

 respectively, — species that occur in fish. 



Only one species of the Class Infusoria is known with 

 absolute certainty to be a parasite of man; this is the 

 ciliate Balantidium coli (Fig. 18), which lives in the 

 large intestine and gives rise sometimes to balantidial 

 dysentery. 



Besides these species, which are recognized by all pro- 

 tozoologists, there is a long list of protozoa that have 

 been described from the digestive tract of man about 

 the authenticity of which there is still some doubt. 



4. TERMS USED IN THE STUDY OF PARASITIC PROTOZOA 



Those who have not interested themselves particularly 

 in parasitology may not be familiar with some of the 



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