664 Notes on a New Infusorian, [July, 
When killed by this mixture, Ctedoctema becomes a nonde 
script object, woolly with distorted cilia, and having tricho- 
cysts like great darning-needles projecting from various parts of. 
the surface. They are occasionally so violently extruded that 
they leave the body and fall away free. The infusorian is iy inch 
in length; the trichocysts are hy inch long, precisely one-half 
Ctedoctema’s greatest length, and but a fraction shorter than its 
transverse diameter. Under suitable amplification they are vis 
ble within the living animal. Those of the posterior extremity 
are arranged nearly parallel with the median line; those of the 
posterior body half are directed forward, those of the anterior 
half backward, toward the center of the creature. They ar 
rigid and straight, and, for their length, coarse and stout, They 
project slightly beyond the cuticular surface and often give the 
Ti; =F were Y 
AN 
AULT {LLM 
Fig. 4 
Fig. 3. with në- 
Fic. 3.—Ctedoctema acanthocrypta, ventral aspect. FIG. 4.——Trichocyst 
ating processes. 
infusorian, in optical section, a minutely crenated 5 
though so skewered the body is still soft and flexible. 
From their distal end they taper evenly to an C think 
and seem to be prismatic. The structural parts a 
have hitherto not been noticed with those of any other 
consist of four, occasionally of only two linear p 
sign-posts at country cross-roads, as shown 1n 
projecting filaments, measuring ywo inch in pire > to ont 
delicacy, and take their origin at a distance a die i 
half their length below the distal p wr ort, bat 
. . * . i ms ht an es tot . : 
Their direction is not always at rig S saak project 
frequently, even in those of the same indivi 
angles of various C5” 
ward or downward, or form ang a distinct 
The oral aperture is not followed by 
ue boards of the 
from the body of the trichocyst, like the eee 4 The : 
of extreme 
i 
