58 CALIFORNIA ACADEMY OF SCIENCES. [ 3 d Ser., 



other cells and do not appear to have any other function 

 than that of locomotion. 



The dark-staining, starlike sphere of the leucocyte, as seen 

 in figs. 14, 15, 16, 18, and 19, is probably homologous with 

 the granosphere of the plasmocyte ; it is the sphere which 

 causes the dell in the nucleus of the leucocyte. The inner 

 pale sphere surrounding the centrosomes in the leucocyte 

 would then correspond to the centrosphere of the plasmo- 

 cyte. In leucocytes stained with toluidine the granosphere 

 is only brought out by several hours of exposure to the 

 stain. This exposure will invariably injure the differentia- 

 tion of the plasmocytes and plasmocytoblasts but it will 

 bring out the granosphere most beautifully, as seen in figs. 

 16b, i8£, and 19a. It will be seen that a ray extending 

 from the archoplasm is covered by different microsomes at 

 different points in the cell. Thus the innermost microsomes 

 consist of particles of granosphere, while the outer ones 

 consist of granules of plasmosphere or blue-staining cyto- 

 plasm. 



In fig. i8<5 the archosome has divided into several 

 smaller semiglobular parts, but the toluidine has not differ- 

 entiated any of its zones nor stained the centrosomes. 



Unclassified Corpuscles in the Blood. — Among the plasmo- 

 cytes I frequently find spherical or oval bodies as large 

 as the smallest plasmocytes. They resemble small nuclei, 

 and when stained with toluidine are semitransparent, with 

 darker streaks like marbled veins. They contain neither 

 layers, spheres, nor globules, and their nature is doubtful. 



Summary. 



1. The erythrocytes in the normal blood of Batracho- 

 seps vary greatly in size and shape, much more so than 

 those of any other known animal. They are in this respect 

 entirely unique. The smallest are smaller than the red cor- 

 puscles of the human blood, while the largest are seven 

 times their diameter. This refers not only to the nucleated, 

 but also to the non-nucleated erythrocytes. 



