216 
Macrostoma mesnili N. Sp. 
PLATE XVI. 
All the figures were drawn from stained specimens. 
Figs. 1—4. Four flagellates showing well the different points of the large forms. The 
size of these is about 14 ^ x 7 /j.. 
Figs. 5 and 6. Two of the smallest forms, not more than 3 n in diameter. Note the 
absence of the cytostome which was possibly not visible on account of the small size. 
Figs. 7 and 8. Encysted forms. The characteristic nucleus and the large cytostome are 
still visible within the cyst. 7 /j. x 5‘5 ft. 
Figs. 9—13. Bodies which are probably degenerative or abnormal developmental forms 
of the flagellate. Similar bodies have been described as encysted stages of Tricho¬ 
monas. Fig. 9 shows the tail of the flagellate still present. All contain a large vacuole. 
The nucleus multiplies in a curious manner. These bodies quickly degenerate and 
break up when they pass out of the intestine. 
