SPIROCHMTA BALBIANIIT AND SPIROCHHTA ANODONTA. 29 
“ myoneme,” meaning “ muscle-thread,” is perhaps not an 
ideal one, yet is far preferable to the term “myocyte” or 
““muscle-cell’’? applied to the layer of similar fibrille in 
Gregarines, which are themselves, as a whole, single cells. 
There appear to be some eight or nine principal fibrils, and 
many less evident ones parallel therewith, all of them appa- 
rently almost longitudinally arranged. Though the existence 
of a network of fine fibrils is not excluded in this clear, 
delicate, and narrow structure, such finer fibrils are in- 
visible. 
Text-rie. 5.—Diagram to illustrate the probable successive origin 
near the ends of the body of the myonemes in the membrane, thus 
giving rise to approximately longitudinal striations in the mem- 
brane. The exact origin of these structures is too fine and delicate 
to determine more definitely under the microscope. No obvious 
connection of the points of origin of the myonemes with the chro- 
matin rodlets can be seen. A scheme for the possible formation of 
myonemes is put forward in Appendix III. 
In slowly moving specimens of 8. balbianii, the edge of 
the membrane, and even the membrane itself, is easily seen 
in life under a Zeiss DD objective and oculars 2 or 4. I 
have been able sometimes to see the edge of the membrane 
in life even under lower powers. In the case of S. ano- 
donte itis seen with greater difficulty, but it shows in life 
even in this case. Such slowly moving forms are curved 
into about two or three sinuosities only, and the membrane 
can be seen, in the troughs of these, loosely arranged and not 
contracted close to the body. 
