i8 



CALIFORNIA ACADEMY OF SCIENCES. 



[3D Ser., 



blast, while the other one, which really is that of a plasmo- 

 cyte, will give a fair idea of the spherical form of plasmo- 

 cytoblasts. 



Centrosomes. 



Plasmosphere. 



ALOSPHERE. 



_ GRANOSPHEEE. 



Centrosphere. 

 somosphere. 



Diagram i. Plasmocytoblast at the pole of a fusiform corpuscle from the blood 

 of a Batrachoseps attemiatus . 



In this diagram the nucleus is represented as being below 

 the base line, but is not further sketched out, its position 

 only being of interest. Immediately above it is the hyalo- 

 sphere, while on the sides of the nucleus extends the plasmo- 

 sphere. Above the hyalosphere, at the base of the cone, is 

 seen the somosphere containing the centrosomes; surround- 

 ing it is the centrosphere, and above it is the large dotted 

 granosphere. The latter is surrounded by the hyalosphere 

 and by the most exterior of all the spheres, the plasmo- 

 sphere, showing fringed or amoeboid projections. 



