506 GENCHO FUJIMURA 



colored homogeneous star-shaped lump, from the surface of 

 which are shot forth a number of processes, which run over 

 directly to the protoplasm between the vacuoles. The proper 

 nucleus is hardly detected. In figure 51 the cell is longish, 

 and the overabundance of plastosomes which are distributed 

 densely almost all over the cell body is the feature of this cell. 

 Between there, is a somewhat large number of vacuoles of 

 various sizes, and no lipoid granules at all are to be found. 



In figures 52 to 54 the various cells illustrated are gradually 

 larger than those described above, the cell bodies are filled with 

 a large number of vacuoles and granules. The latter are ex- 

 tremely irregular in size and density and are sometimes found as 

 contents of the former. The plastosomes are mostly short rods, 

 and especially in figure 52 they are somewhat abundant, and 

 some are found massed along one side of the nucleus. In figures 

 53 and 54 they are comparatively fewer and lie scattered, between 

 the vacuoles. The thin layer on the surface of the cell is 

 thicker and more distinct in this kind of cell, to such an extent 

 that it almost reminds us of the ordinary ceU membrane. In 

 figure 53, as in figure 50, we notice a black-colored round-shaped 

 lump at the location of the nucleus; however, in this case, the 

 surface of the lutnp is smooth and has no process. Comparatively 

 few cells have such a black-colored lump, and, as in these 

 cells it is always difficult to tell the whereabouts of a nucleus 

 of normal condition, I am quite at a loss to know whether or 

 not the dark lump described above should be deemed a modi- 

 fication of the nucleus or regarded as that part of the protoplasm 

 which is just adjacent to the nucleus which has, by reason of 

 its staining properties, obscured the nucleus. This question, 

 along with the stained lumps in the syncytium layer as illustrated 

 in figure 10, constitutes a puzzle, and I have mentioned it here 

 for the sake of future investigations. However, in view of the fact 

 that numerous plastosomes, which are the important elements of 

 a living cell, are always demonstrated in the cells concerned, while 

 at the same time they present no noticeable regressive phenomena. 

 I am rather inclined to believe that it is possible to attribute a 

 certain functional significance to these unknown lumps. 



