154 



ARCHEGONIATES. 



as food material in the growth of the blepharoplasts and other parts 

 of the cell. During the telophase the blepharoplast is represented by 

 a more or less irregular or spherical mass of granules, which have evi- 

 dently been derived by the breaking up of the membrane. "It would 

 seem that the outer membrane of the blepharoplast breaks up into 

 numerous segments or granules, which assume a roundish or elliptical 

 form, and through the action of the cytoplasm become crowded to- 

 gether in a mass occupying the position of the original blepharoplast." 

 About the time of the reconstruction of the daughter-nuclei and the 

 formation of the plasma membranes separating the cells, the develop- 



FIG. 63. Further development of blepharoplast. (After Webber). 



A, two attached spermatozoid mother-cells (spermatids) resulting from division of generative cell; 



the band of blepharoplast is being formed by fusion of granules. 



B, fusion of granules to form the band. 



C, formation of ciliferous band by fusion of granules, more highly magnified. 



ment of the band, which is to bear the cilia, begins. It appears first 

 as a short, delicate, and deeply staining line extending from the mass 

 of granules toward the nucleus (Fig. 63, A). A little later a similar 

 line or band can be seen on the opposite side of the mass of granules. 

 From Fig. 63, B, it is apparent that the band is developed more or 

 less directly from the granules. The band, which at first is very nar- 

 row, increases appreciably in width (Fig. 63, B, C). The further 

 development of the band with its cilia and the transformation of the 

 daughter-cell into a spermatozoid closely resembles that of Cycas, 

 already discussed at some length in the preceding pages, with the very 

 noteworthy exception that in Zamia there is no nuclear beak formed, 



