52 bulletin: museum of comparative zoology. 



phase, anaphase, and early telophase the rays cross each other in the 

 equatorial region and proceeding onward in a straight line attach them- 

 selves to the cell wall beyond, as shown in the accompanying text figures, 

 which are diagrammatic drawings of actual cells. 



Fig. H. 



Fig. H. Diagram of the astral rays in the anaphase. The branching of the 

 fibres lias partially disappeared owing to their coalescence to form thicker fibres. 

 The region of attachment upon the membrane is more limited. 



Fig. I. 

 Fig. I. Diagram of the astral rays in the early telophase. The branching has 

 entirely disappeared and the constriction of the cell wall has begun. The area 

 of attachment of the fibres is still smaller and is limited to the region actually 

 undergoing constriction. 



