222 The Philippine Journal of Science ms 



one of the few protozoa that are bilaterally symmetrical. The 

 organism is pear-shaped and measures from 10 to 21 p, with 

 a width of from 5 to 12 p. There is an anterior, oblique depres- 

 sion or sucking disk, the contractile edges of which are raised 

 above the general surface. There is no mouth or cytostome. 

 Two axostyles extend from the region of the sucking disk to 

 the posterior end, where they continue as two stout flagella. 

 There are three other pairs of flagella arising from the borders 

 of the hollow disk, giving eight flagella in all. The organism, 

 as usually seen, is binucleate, the two nuclei of the karyosome 

 type lying within the sucking disk, one on each side of the 

 axostyles. Stained, the organism bears a most grotesque re- 

 semblance to a spectacled face. This resemblance extends even 

 to the cysts. 



Enteromonas hominis da Fonseca, 1915. This organism has 

 been placed in the Tetramitidinse by Chalmers and Pekkola. 2 

 They describe it as being equipped with three unequal anterior 

 flagella, lacking a permanent cytostome, undulating membrane, 

 and axostyle. The nucleus is of the protokaryon type and is 

 joined to the blepharoplasts by a rhizoplast. This organism 

 they believe to be allied to the genus Dallengeria Saville-Kent, 

 1880. Chalmers and Pekkola regard this organism as patho- 

 genic to man, giving rise to diarrhoea, "and by absorption from 

 the bowel febrile attacks." They record three cases of this in- 

 fection, the first being reported from Brazil by da Fonseca and 

 the other two in the Anglo-Egyptian Sudan by themselves. 

 They venture the prediction that it may be ultimately found to 

 be widespread throughout the tropics. 



Tetramitus mesnili Wenyon, 1910. See Macrostoma. 



Cercomonas hominis Davaine, 1854. Cercomonas is a very 

 uncertain genus, but a great convenience to those who are unable 

 otherwise to classify an intestinal flagellate. The descriptions 

 vary greatly, and undoubtedly other flagellates such as Trichomo- 

 nas, Macrostoma, and the like have been called Cercomonas by 

 unskilled observers. Cercomonas is described as having a pear- 

 shaped body, 10 to 12 p long, which tapers to a point posteriorly. 

 ' The flagellum is said to be about 20 p long. A cytostome has 

 been described by some writers. 



Prowazekia Hartmann and Chagas, 1910. Species reported 

 as occurring in fasces are: Prowazekia cruzi, Prowazekia asiatica, 

 Proicazekia weinbergi, and Prowazekia javanensis. The general 

 characteristics of this genus are the possession of two flagella, 



'Bull Soc. path. exot. (1917), 10, 756. 



