With Plates II and III.
I.—METHODS.
II.—MATERIAL.
III.—OBSERVATIONS.
(_a_) NUCLEUS.
(_b_) Cytoplasmic Structures.
1. Nebenkern.
2. Acrosome.
3. Axial Filament.
4. Centrosome.
5. Cell Body.
(_c_) The Spermatozoon.
IV.—COMPARISON OF RESULTS.
V.—SUMMARY.
It is the object of these studies to follow carefully the spermatid
transformations, and, if possible, to get a complete series of
changes occurring therein. I do not pretend that I have as yet found
all the stages, but in the present paper will publish observations
made on _Gryllus assimilis_ pertaining chiefly to the nebenkern, of
which I have found some stages not previously described, as far as I
know. I shall first describe my own findings, and then compare them
with the results of others.