308 NOTES ON SOME CANADIAN INFUSORIA. 
other will give a quick sudden jump, settling to repose again almost 
immediately. 
C. margaritaceum (fig. 4) differs from the preceding in many 
respects. It presents the same hood-shaped structure (1) at the 
mouth, which is in the same position, but the hood is not nearly as 
large as that of @. glaucoma. It is somewhat large, measuring 
0.024 mm., presents a somewhat pearly appearance, and is covered 
with minute tubercles. The arrangement of the cilia is also very 
different, the anterior three-fourths being covered with ordinary small 
cilia, while at the posterior extremity are a few setae. It is con- 
stantly in motion, seldom resting, and never moving in the quick 
jerky manner characteristic of the other form. 
The two following forms I observed in water from the University 
creek, Toronto, which had been allowed to stand for some time, and 
was almost destitute of green matter. 
VORTICSLLA MICROSTOMA, EHERH. 
The striations in this form (fig. 5) are not easlly seen, but may be 
observed most readily under oblique illumination. My object in 
mentioning it is to confirm, or rather partially confirm, a phenomenon 
observed by Kent. While watching one of these animalcules, I 
observed it suddenly leave the stalk, which immediately contracted, 
and swim away by means of the cilia of the disc, not developing a 
posterior circle as is usual in such cases. The consequences of this 
action I was unable to follow, as by the next morning the animal 
was dead. Kent, however, has been able to follow it farther, and 
states that it encysts, the cyst having a characteristic appearance. 
ENGLENA ACUS, EHERH. 
This form (fig. 6) occurred in considerable abundance. It was 
0.126 mm. in length, and is mentioned on account of the entire 
absence of the green colouring matter which usually characterizes all 
members of this genus. The red eye-spot(e) was however plainly 
visible. This was probably owing to their not being able to procure 
their accustomed food. Kent, in 1880, received specimens from 
near Birmingham, averaging 0.169 mm. in length, which presented 
the same peculiarity, which he attributes to the above mentioned 
cause. His forms were all exceedingly attenuate and stiff in their 
motions. Certain of the forms I observed were capable of consid- 
