512 GENCHO FUJIMUEA 



75 the cell is remarkably elongated, and within are contained 

 a great number of lipoid granules. The nucleus is oval with 

 a nuclear network distinctly observed; from this period on no 

 more traces of cilia are to be found. The various cells illus- 

 trated by figures 76 to 78 gradually increase in their size and, 

 since their swelling is remarkable, especially in the upper half, 

 it is usual that this part of the cell naturally juts far out into 

 the lumen, though the lower half, being comparatively narrow, 

 is closely united with the basement membrane. Within the 

 cell body are contained a great number of both lipoid granules 

 and vacuoles, of which the vacuoles in figure 76 are as yet 

 small and few and they chiefly occupy positions in the upper 

 half of the cell body, whereas in figures 77 and 78 the vacuoles 

 enlarge tremendously and fully occupy the upper half, in conse- 

 quence of which cell bodies have the appearance of a honey comb 

 in a high degree, and the protoplasm remains only as a thin 

 wall which separates the vacuoles. The lipoid granules in the 

 latter two kinds of cells chiefly crowd together at the base of 

 the cell bodies, and only a small portion of them are left behind 

 as contents of the vacuoles. The afore-mentioned three cells 

 each present conspicuous nuclear network and nucleoli. And 

 in the various cells in figures 75 to 78 no plastosomes are to be 

 detected. 



Figure 79 illustrates a large oval-shaped cell, which has a 

 similar-shaped large alveolar nucleus. The cell body, because 

 of the vacuolar formations of various sizes, presents the image 

 of a conspicuous honey comb, while the plastosomes lie scattered 

 somewhat plentifully in the interstice between the vacuoles. 

 Though there are some extremely small vacuoles in jet black, 

 no ordinary lipoid granules in coarse grains are to be found. 

 The contents of the nucleus are nearly homogeneous, and 

 the characteristic nuclear network is not found, but within 

 the nucleus there are two nucleoli. Figure 80 is an extremely 

 irregular-shaped cell, with the nucleus of a corresponding 

 shape. The structure of the cell body is nearly the same as 

 that in the preceding figure, and the vacuoles are somewhat 

 plentiful, but the plastosomes are very few, and, besides, there 



