f2 E. H. STRICKLAND 
7.8.x 4.7 to 5.1u. These two types of spores are termed “micro- 
spores’ and ‘macrospores’ respectively. If weak iodine solution be 
added to the water in which they are floating a greatly attenuated 
filament which measures about 170 to 220, or thirty to forty 
times the length of the spore, is usually projected (pl. 3, fig. 25.). 
Life history. This can be determined only from sections about 
5 thick. The early stages have not been found. 
Myxosporidium. ‘The parasite at the time of discovery was 
in a rather advanced state of sporulation. No differentiation 
into ectoplasm and entoplasm could be distinguished in the 
myxosporidium, the more central portions of which had for the 
greater part sporulated. In stained sections there was no sharp 
differentiation between the developmental stages and the spores 
as was the case with Glugea bracteata, since the chromatic mat- 
ter of the former retained the haematoxylin stain. The secre- 
tions, then, have the characteristic appearance shown in plate 
3, figures 2 and 3. Around the periphery of the myxosporidium 
the myxoplasm had not been entirely transformed into sporonts 
but contained numerous small masses of slightly staining gran- 
ular chromatin. Many of these apparently free nuclei were in 
a state of division (fig. 4), which appeared to be typically amitotic. 
Around these nuclei a slight condensation of the myxoplasm 
could be detected. These condensed areas became globular and 
were finally invested with a delicate membrane (figs. 5 and 6) 
until each became a spherical sporont about 5.5y in diameter. 
Sporonts. The nucleus of the sporonts becomes very irregular 
(pl. 3, fig. 6) and apparently undergoes a form of purification, 
for in some cases a few chromatin grains are passed out to the 
surface of the cell where they disintegrate. The nucleus then 
assumes a more definite form and the sporont continues to grow 
until it measures about 12y in diameter, when the nucleusagain 
becomes active and divides. There seem to be two forms of 
‘division at this stage. In one the nucleus becomes ring-shaped 
and this ring draws out as shown in figures 7 and 8. In the other 
the globular chromatic mass simply divides by amitosis to form 
two hemispherical masses as shown in figures 10 and1ll. Each 
of the nuclei thus formed redivides. I saw this division only 
