INTESTINAL FLAGELLATES 



chomonas was suggested by Kofoid (1920) for tricho- 

 monads with 3 anterior flagella and Pentatrichomonas 

 by Mesnil (19 14) for those with five. Certain proto- 

 zoologists {e.g., Wenyon, 1926) prefer to consider 

 trichomonads that differ with respect to the number of 

 flagella as varieties of the genus Trichomonas. In the 

 following pages the terms Tritrichomonas, Trichomonas 

 and Pentatrichomonas will be used to indicate the 3, 4 

 and 5 flagellated types. 



2. CHILOMASTIX 



This genus (Fig. loa) is characterized by the presence 

 of three anterior flagella, a large cytostome in which 

 is located a short flagellum, two cytostomal fibers, a large 

 anteriorly placed nucleus and a group of blepharoplasts. 



3. EMBADOMONAS 



Embadomonads (Fig. 11 a) possess two flagella; one 

 is long and slender and directed anteriorly, the other 

 short and thick and directed posteriorly. There is a large 

 cytostome, and an anteriorly located nucleus, on the mem- 

 brane of which are two blepharoplasts. 



4. TRICERCOMONAS 



This type (Fig. 12a) has three anterior flagella and 

 a trailing flagellum which is attached to the surface of 

 the body. The nucleus is large and contains a massive 

 karyosome. There is no cytostome. Considerable con- 

 fusion exists with respect to this genus and the genus 

 Enteromonas of Fonseca (1915, 1920). The latter was 

 described as a minute spherical organism with three 



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