224 
H. M. M'OODCOCK. 
of the female gametocytes, according to Berliner, also agrees 
on the whole with the condition I have found. In most 
individuals the nucleus has a close resemblance to the charac- 
teristic flagellate type of nucleus. It appears as a very cleai-, 
round area, of relatively small size, which is sharply maiked 
off from the surrounding cytoplasm and is most probably 
limited by a definite tnembrane ; in the centre is a prominent, 
intensely staining karyosome (figs. 24-27). Berliner figures 
distinct rays passing from this central karyosome to the peri- 
phery of the nucleus. I certainly believe in the presence of 
these rays, serving, as it were, to sling the karyosome in 
position, but I cannot figure them for the simple reason that, 
even under the best optical conditions at my disposal, I am 
unable to actually see them myself; and I may say that 
others, who have kindly scrutinised several individuals on 
mv preparations with this object, have also failed to discern 
them. Nevertheless I remember perfectly well once show'ing 
one of tbe«e preparations to my colleague Miss Robertson, 
then working in this laboratory, and she distinctly saw some 
rays in two or three cases, and sketched them forme. Hence, 
in the determination of these extremely delicate and difficult 
points one’s own powers of vision are an important factor. 
Very frequently, at one side of the nucleus and usually close 
to, almost in contact with the membrane is a distinct granule, 
which is small and does not stain black so intensely (figs. 24- 
27). Now and again an obvious fibril or spindle connects 
this granule to the karyosome in the nucleus (cf. also 
Berliner’s figures). 
'riiis was the nuclear constitution of Halteridium as I 
knew it when I wrote the postscript (a propos of Berliner’s 
figures) to the paper by Minchin and myself (5) on the 
comparison of the nuclear structure of Hfemogregari n a 
triglge and Trypanosoma raiae, and when I wi’ote the 
note on Halteridium fringillae in my first study on 
Avian Hacmoprotozoa (9). It will be generally admitted, I 
think, that in view of the pronounced difference shown between 
this type of nucleus and that of Hasmogregarines (as the 
