PHAGOCYTOSIS IN PERIVESICAL FLUID OF ARBACIA. 



149 



Whereupon the membranous processes of the ectoplasm began 

 to shrink and the leucocyte to elongate (Fig. 4). Several red, 

 yellow and colorless amibocytes which were in the vicinity 



c. 



FIG. 3. Group of cells in perivisceral fluid on slide. Semi-diagrammatic. 

 X 1,000. 



adhered to the margins of the leucocytes as if the latter were 

 secreting a sticky substance. At the end of one and a half 

 hours the leucocytes had become extremely elongate and the 

 membranous projections had entirely disappeared (Fig. 5). 

 The filamentous projections left from the membranes extended 

 across the field and came into contact with those of the neigh- 

 boring leucocytes so that a meshwork was established to which 

 the larger pigmented and colorless amibocytes adhered.. 



FIG. 4. Same group of cells as in Fig. 3, drawn 30 minutes later to illustrate 

 beginning of clot formation. Semi-diagrammatic. X 1,000. 



