70 CALIFORNIA ACADEMY OF SCIENCES. [3D See., 



this case the granosphere is a very narrow, deep blue zone, which surrounds 

 the large, paler blue centrosphere. The soraosphere is dark blue, with a 

 bright pink and very large food-granule. The explanation of these spheres 

 is, however, only tentative. 



49. A very typical plasmocyte. Eosin-methyl blue " O." The hyalosphere 

 is pink; the granosphere deep blue; the centrosphere is large and pink, while 

 the inner somosphere is starlike and blue, with a few dark centrosomes. 



50. The principal interest in this figure is the starlike centrosphere, con- 

 taining a few dark centrosomes. Compare fig. 26, where a similar form of 

 centrosphere is seen. 



51a and b. Two starlike plasmocytes In a the granosphere is very narrow 

 and the cntrosphere very large. In b the archosome is not well differ- 

 entiated. 



52. A round plasmocyte, well differentiated, but not deeply stained. The 

 pale, rather poorly defined centrosphere contains three very distinct centro- 

 somes of different sizes. 



53. The granosphere contains two distinct zones, the inner of which is 

 deep violet. The centrosphere is paler violet. The darker center is the 

 somosphere, with a few very indistinct centrosomes. 



54. Stained with Ehrlich-Biondi, showing poor differentiation. The cen- 

 trosomes lie at one edge of the oblong centrosphere. 



55. A fully grown plasmocyte. The granosphere contains concentric layers 

 of denser cytoplasm. The centrosphere is denser violet. The centrosomes 

 are arranged in a crescent along the margin of the somosphere. 



56. An oblong plasmocyte, with at least three archosomes imbedded in the 

 granosphere. There are two small centrospheres to the left and one very 

 large one to the right, the latter extending half across the granosphere. The 

 large round globules must be explained as centrosomes with somospheres; 

 the smaller, dark granules are of doubtful nature. 



57. The hyalosphere is unusually large; the granosphere is violet. There 

 is one large centrosphere, with two distinct centrosomes. 



58a. In this plasmocyte the three centrosomes are remarkably distinct, 

 and of different sizes. The paler sphere is the centrosphere, there being 

 no distinct somosphere. The granosphere is deep blue, darker at the 

 left side. 



585. A plasmocyte of very much the same nature as the last, only much 

 larger. Here also the centrosomes are distinct and the somosphere is not 

 stained. 



59. I have referred to this figure in the text as possibly representing 

 a plasmocyte surrounded by a membrane. It is remarkable in showing 

 no frayed plasmosphere and no clearly differentiated hyalosphere. The 

 dark blue sphere is the granosphere. The round pink one is the centro- 

 sphere. The centrosome is seen clearly in the center, as a very small dot. 



60. An oblong plasmocyte with four distinct controsomes. The grano- 

 sphere is narrow and very dark; the centrosphere is paler and large; the 

 rectangular field in the center is either only a part of the centrosphere or a 

 greatly extended somosphere. 



61 . A plasmocyte with two archosomes, one of which contains two cen- 



