134 Notes on some apparently undescribed | February, 
The creature, when in a healthy or comfortable condition, is 
very slightly if at all changeable in shape. When about to die it 
takes a sub-spheroidal form and becomes diffluent, but this stage 
is at times postponed until the animal has passed a short period 
as a granular amoeba, with a large and conspicuous contractile 
vesicle, slowly moving by a forward flow of a sarcode wave unat 
companied by the posteriorly located granules. The motion of 
the Heteromita when swimming is rapid and oscillating, being @ 
forward movement by short zig-zags, the animal at the same i 
rotating on its longitudinal axis. | 
The anterior vibratile flagellum is ordinarily extremely difficult 
to detect. The zodid, when attached, rests at the extremity of its 
anchoring flagellum, and when viewed dorsally the vibrating lash 
is visible for only the very short distance between its origin and 
the point where it curves to pass beneath the lower or ventral 
surface (as in Fig. 1), this part being flexilife but apparently not 
vibratile. Even when in a favorable position for its own démon- 
stration, the rapidly-moving filament becomes visible only after 
careful manipulation of the mirror, or after the infusorium a 
been killed by iodine or osmic acid. Small particles are not 
affected by its motion until they have floated past the anterior . 
margin of the body, sometimes almost in contact with the surface ; 
when they fall into the stream and are dashed upward, at tin > 
performing a complete circuit around the animal to the starting : 
point. If solid food is taken, which I doubt, it must enter throug 
the ventral surface. No solid particle has been seen to pass T , 
the endoplasm, although I have tried to feed the creatures go ; 
indigo, and have had the same individuals in a growing-slide 
four full days surrounded by myriads of bacteria. = 
The contractile vesicle pulsates quickly and sharply once pS 
nine seconds. The only method of reproduction observed !S 
longitudinal fission. The species here referred to is remat fe 
_ for its stability of form and for the position of its tractellum i 
vibrating flagellum, the latter peculiarity having been recorded 1" l 
‘no other member of the genus. fae 
In the same animal maceration, as the Heteromite weie ye 
pearing, many ciliated infusoria were developed, which, accordi 
to the latest schemes of classification, can be relegated bay i 
genus Tillina only, although, so far as external contour § wer fh 
cerned, the resemblance is remote. This difference of form, 
