660 Notes on a New Infusorian. (July, 
shape, its form being elongate-ovate, subcylindrical and slighty 
compressed, widest and rounded posteriorly, thence tapering evei 
to the obtuse mesially placed anterior point. The entire cutie 
lar surface is ciliated, the cilia being long and fine, their leagă 
often exceeding the short diameter of the body. They a 
arranged in rows that are more distinctly seriate on the domi 
aspect. Ventrally their arrangement is more irregular, a% 
here they seem to be constantly in motion. All are fexik 
and all are at times put into vibration, but each individu : 
filament upon the lateral and dorsal surfaces is capable of in’ 
pendent movement. When their tips are focussed, scattered ol 
are seen to tap and patter against the cover-glass, and the fouro 
five stiffer, more setose hairs projecting from the posterior & 
tremity quiver and occasionally lash the water as if the 
had hardly time to eat. One of these postero-terminal cilia bas 
its distal extremity conspicuously curved, as is shown i age 
ures. When the infusorian is at rest, the cuticular cilia, s 
the exception of those on the ventral aspect, do not gr 
stand out from the surface like long bristles; at such times wae 
only additional actively moving cilia are those of the 7 
and a single row on the left lateral body margin. As all ofthe 
ture is rapidly swimming, to distinguish whether any OF ® a 
cilia are in motion is next to impossible. It is only pAn 
moments preceding death by iodine poisoning that paes 
can be answered, as it is in the afirmative, not a cilium : 
idle. a 
_ In its movements the creature is wonderfully sone 
across the field so quickly that the looker-on a gosi 
something has passed by. Even when a pleasant pai pià | 
is discovered under the lee of an algous filament so 
of dirt, the lively animal cannot rest, but = half its jog? 
almost regular intervals darts forward for one in this f A 
and as quickly slips back to its former position. =. ss 
mic swing it seems to use the tips of the pin of the 2 : 
fulcra, thus converting itself into an ant ght and the pivot da 
class, where the power is between the weig 
In Fig. 1 Ctedoctema is represented in its 7 8 extreme 
with the camera lucida and magnified 700 figure, uam 
length is ,d, inch. The nucleus, as shown in the palf The 
and situated about mesially in the anterior 
