FURTHER OBSERVATIONS ON C^CAL PARASITES OF FOWLS. 57 
same difficulty has to be met in the case of a vast majority of 
free-living flagellates, and, probably, in that of all the free- 
living Amoebae ; and partly by means of pure infections 
obtained in our series of infected chicks, and partly by com- 
parison with similar parasites in other vertebrates, we have 
obtained evidence which we believe justifies us in dividing 
Text-fig. 4. 
Trichomastix gall inarum, showing four free flagella, 
blepharoplast, cytostome, nucleus, chromatic blocks, chromatic 
line, and axostyle. 
the animal parasites found in the cseca of fowls into the 
following species. [The evidence on which this division is 
based will, of course, be found in the special part of the 
paper.] 
(1) Cliilomastix gallinarum (sp. nov.). 
(2) Trichomonas gallinarum (sp. nov.). 
(3) Trichomonas Eberthi (sp. nov.). 
(4) Trichomastix gallinarum (sp. nov.). 
The chief poiuts of resemblance and difference between the 
