364 



KOFOID AND SWEZY 



EXPLANATION OF PLATES. 



All figures have been made with camera lucida from material in smears from 

 the intestinal wall fixed in Schaudinn's fluid and stained with Heidenhain's 

 iron haematoxylin or with alcoholic iron haematoxylin. 



PLATE 1. 



Trichomonas augusta AlexeiefT, from intestine of Diemyctylus torosus unless 

 otherwise stated. Trophozoite and early prophase of mitosis. X 2175. 



Figure 1. Trophozoite seen from the right side with axostyle overlying the 

 nucleus and projecting posteriorly, and cytostome at the 

 anterior end. 



Figure 2. The same, with intranuclear chromidial cloud, and cytoplasm 

 forming a posterior blob enveloping the axostyle. 



Figure 3. Trophozoite in contracted condition with undulating membrane 

 thrown into a spiral, intranuclear chromidial cloud, central 

 karyosome, and well-defined posterior axostylar ring. 



Figure 4. Axostylar chromidia grouped in the capitulum overlying the 

 nucleus. 



Figure 5. Cytostome much elongated, axostylar chromidia distributed, 

 undulating membrane thrown into a spiral, and removed 

 posteriorly from the region of the emergence of the axostj'le 

 (cf. Figs. 3,4). 



Figure 6. Early prophase showing first step in splitting of chromatic 

 margin. Note small vacuoles and two large ones with (para- 

 sitic?) Micrococcus. 



Figure 7. The same, blepharoplast divided, chromatic margin spht to its 

 posterior end, one new anterior flagellum growing out; axo- 

 style constricted near the middle; unusually large (abnormal?) 

 spheroidal chromidial (?) masses in cytoplasm, and axostyle 

 with median constriction. 



Figure 8. Very large trophozoite with undulating membrane, the chromatic 

 margin and the posterior flagellum completely divided. One 

 daughter membrane completely detached in preparation of 

 the smear; one anterior flagellum completely grown out, 

 many axostylar chromidia, but none in the cytoplasm; 

 blepharoplast quadripartite. 



Figure 9. Large trophozoite in prophase. Extranuclear chromidial cloud 

 about the nucleus full of fine granules; few cytoplasmic 

 chromidia present; coarse chromatin skein in nucleus. 



Figure 10. The same, with chromatin organized in five chromosomes; 

 one flagellum growing out. 



