INTESTINAL FLAGELLATES IN GENERAL 121 



which is Heterouiita iincinata, which has been observed in human 

 feces. An interesting species, Costia nccatrix, grows on the skin of 

 fish to which it attaches itself by means of its flagella. It is 

 accused of being pathogenic, especially to young fish reared in fish 

 hatcheries. 



In 191 5, Fonseca proposed the genus name Enteromonas for 

 a flagellate that he found in human feces in Brazil. The status 

 of this genus and of the several species that have been described 

 is not clear. It has been suggested that Enteromonas is the same 

 genus as Triccrcomonas which was found by Wenyon and O'Con- 

 nor in 191 7. Enteromonads have been described from rabbits and 

 guinea-pigs and a careful study should be made of the intestinal 

 flagellates of these animals in order to determine the validity of 

 the genus Enteromonas. 



A very interesting genus is Tetramitus to which a number of 

 free-living species belong, some of which appear to have been 

 found living in fecal material. Bunting (1926) has described 

 a very remarkable life-cycle in a Tetramitus which she cultivated 

 from the caecal contents of rats. This life-cycle includes an 

 amoeboid stage, a flagellate stage and cysts. This work should be 

 confirmed and extended to other intestinal flagellates that may 

 have similar life-cycles. 



A number of families of intestinal flagellates contain one or 

 several species that have attracted the attention of investigators, 

 most of which would repay further study. The family bodonid^ 

 contains forms that have been reported from the feces and urine 

 of man (Powell and Kohiyar, 1920). A species was also observed 

 by Knowles and Das Gupta (1924) in saliva from the human 

 mouth. Bodo caudatiis frequently occurs as a coprozoic form and 

 Bodo edax less frequently. The family prowazekellid^ includes 

 an interesting species, Prowazekella lacertce, which occurs in the 

 intestine of lizards and salamanders. An interesting phase in its 

 Hfe-cycle has been described as cyst formation. Cysts containing 

 about sixty-four flagellates occur in the intestine of the lizard. 

 Transmission appears to take place when infected Hzards are 

 devoured by other lizards. 



The next two families to be considered contain human intestinal 

 flagellates. The family embadomonadid^ includes Embadomonas 

 intestinalis which was described from man by Wenyon and O'Con- 

 nor (1917). Other species have been reported from lower animals 



