374 



KOFOID AND SWEZY. 



PLATE 6. 



Multiple fission in Tetratrichomonas prowazeki Alexeieff. X 2175. From 

 Diemyctylus torosus. 



Figure 67. Early prophase in rounded up trophozoite with intranuclear 

 chroniidial cloud and food vacuoles with contained plant cells. 

 Note four anterior flagella, undulating membrane with chro- 

 matic margin and basal rod arising from the blepharoplasts, 

 axostyle, and large cytostome. 



Figure 68. Free-swimming trophozoite with large blepharoplast. 



Figure 69. Trophozoite with intranuclear chromidial cloud, which has 

 engulfed a cyst of the yeast Blastocystis enterocoela Alexeieff, 

 reputed by Prowazek (1904) to be trichomonad cysts. 



Figure 70. Binary fission or formative phase of Plasmodium or somatella 

 with two nuclei still connected by paradesmose, each with 

 four cliromosomes ; food vacuoles with contents in cytoplasm. 



Figure 71. Somatella with eight nuclei each with central karyosome and 

 motor apparatus attached to blepharoplast. 



Figure 72. Same, with nuclei filled with dense chromidial cloud and fine 

 granules; elongated cytostomes and several axostyles visible. 



Figure 73. Somatella in disintegrative phase with seven nuclei w'ith dense 

 intranuclear chromidial cloud. 



Figure 74. Same with five nuclei with several karyosomes and light cloud. 



Figure 75. Same with four nuclei and intranuclear cloud. 



Figure 76. Same with three nuclei, with dense intranuclear cloud and very 

 large deeply staining cytoplasmic spheres, possibly abnormal. 



Figure 77. Same with two nuclei and persisting plasmodesmose indicating 

 recent detachment of the sLxth merozoite. 



Figure 78. Somatella with two nuclei resulting either from binary fission 

 or the last phase of the disintegration of an 8-nucleate Plas- 

 modium. 



