. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BLACKMAN : THE SPERMATOGENESIS OF SCOLOPENDRA. 51 during the metaphase the astral rays which extend through the cytoplasm in the neighborhood of the spindle are very numerous and exceedingly well developed, much more so than those which are directed toward points nearer the poles of the cell. The latter are few and comparatively inconspicuous. Each of the stronger fibres as it approaches the equatorial region divides into several branches, slightly liner than the main fibre, but still very definite and easily differen
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BLACKMAN : THE SPERMATOGENESIS OF SCOLOPENDRA. 51 during the metaphase the astral rays which extend through the cytoplasm in the neighborhood of the spindle are very numerous and exceedingly well developed, much more so than those which are directed toward points nearer the poles of the cell. The latter are few and comparatively inconspicuous. Each of the stronger fibres as it approaches the equatorial region divides into several branches, slightly liner than the main fibre, but still very definite and easily differentiated from the cytoplasmic reticulum. These branches proceed through the dense outer layer of cytoplasm and may be distinctly seen to come into contact with the cell membrane. I believe there can be no reasonable doubt that they attach. Fig. U. Fig. G. Diagramatic representation of a few of the astral rays in the meta- phase. The fibres are much branched and cross in the equatorial region. The branches come in contact with the cell membrane and probably are attached to it. themselves to this structure. I have never seen instances where the peripheral astral rays from one pole unite and become continuous with those of the other as is apparently the case with the spindle fibres. On the contrary, it can be definitely seen that they behave in quite a different manner. Each ray in the peripheral equatorial region is sharp and dis- tinct, and in sections parallel to their course can often be traced from their origin in the centrosome to their points of insertion in the cell membrane. It can be very plainly demonstrated that during the meta-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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