64 H. B. FANTHAM. 
“basal granules.” Hence a gap would occur between the 
“asal granules” and the rest of the chromatin helix, and 
such a cytoplasmic gap actually is seen in the organisms in 
question (see Pl. 1, fig. 5; Pl. 2, figs. 16, 27; PI. 3, fig. 22). 
Possibly by a transverse outward migration of chromidia 
and subsequent concentration along lines in the periplast or its 
appendages, myonemes are produced. They might also be 
formed by chromidia from the “ basal granules ” migrating 
along approximately longitudinally disposed lines ; and per- 
haps the thickened edge of the membrane is really finely 
continued into the basal granules, and might even be com- 
pared with the ‘‘marginal flagellum” of the undulating 
membrane of a Trypanosome. . 
In the case of Protozoa with a condensed nucleus and also 
possessing myonemes, like the Trypanosomes, the myonemes 
are formed from the “ mantle fibres.” The matter, however, 
is most difficult, indeed almost impossible, to decide in the 
case of such attenuate organisms as Spirocheetes. 
August 14th, 1907. 
ADDENDUM. 
Since the foregoing was written several papers have ap- 
peared with a more or less direct bearing on the subject. 
Bourne (82) has given an excellent account of the crystalline 
style in Ainigma which confirms several of the remarks 
made in Appendix I. SBourne also recalls attention to 
Barrois’ work, which Mitra had apparently overlooked. 
Further notes by Schaudinn (34) on Spirocheetes, especially 
S. plicatilis, have appeared, but no figures as yet. Lastly, ~ 
I have just published a preliminary account (838) of my 
researches on Spirocheetes in the form of .an abstract of this 
memoir. 7 
Swellengrebel’s longer and illustrated memoir (35) appeared 
in July. Herein, the author notes that the greater number of 
oysters examined by him did not contain a crystalline style 
