164 University of California Puilications in Zoology [Vol. 20 



(Grassi) becomes available for the Giardia from man in place of 

 intestinalis (Lambl). 



The name Giardia lamblia Stiles (in litt.) proposed in Kofoid and 

 Christiansen (1915&, p. 28) as a substitute for the preoccupied intes- 

 tinalis becomes therefore a synonym of G. enterica. 



SUMMAEY 



1. Cercomonas is not as yet proved to be a human intestinal para- 

 site, but coprophilie species of this genus occur in stale stools or in 

 stool cultures. Cercomonas of clinical literature is probably Chilo- 

 mastix. Flagellate stages of Craigia may have been reported as 

 Cercomo7ias. 



2. Cercomonas hominis Davaine (1860) was a complex of two 

 species. His var. A, named Cercomonas davainei by Moquin-Tandon 

 (1860), is Chilomastix. The correct name for Chilomastix is not C. 

 mesnili (Wenyon) but C. davainei (Moquin-Tandon). 



3. Davaine 's Cercomonas hominis var. B is the human intestinal 

 Trichomonas, the correct name of which is T. hominis (Davaine). 

 Cercomonas obliqua Moquin-Tandon (1860), Trichomonas intestinalis 

 Leuekart (1879), and T. confusa Stiles (1902) are synonyms of T. 

 hominis. 



4. The type species of Trichomonas Donne (1837) has four free 

 anterior flagella, hence Tetratrichomonas Parisi 1910 is a synonym 

 of Trichomonas. Trichomonas hominis from the intestine and T. 

 buccalis from the mouth also have four flagella. 



5. A flagellate of the mouth was first described by 0. F. Miiller 

 (1773) as Cercaria tenax, but the description and figure are too meagre 

 to permit re-identification. Tetratrichomonas huccalis Goodey and 

 AYellings (1917) should be transferred to Trichomonas. 



6. A new genus Tritrichomonas is established for trichomonad 

 flagellates with three anterior free flagella with T. augusta AlexeiefE 

 as type species. 



7. Giardia enterica (Grassi) 1881 has priority over Lamblia intes- 

 tinalis (Lambl) Blanchard 1888, and over Giardia lamblia Stiles 1915. 



Transmitted April 19, 19S0. 

 Zoological Laboratory, IjNrrEEsiTY of California, 

 Berkeley, California. 



