PLATE IV. Fig. 7. Cnidoblasts in syncytial relationship during the be- 

 ginning of nematocyst development. Double membranes are present in the 

 cytoplasm. See figures 8 to 10. 



Fig. 8. Cnidoblasts in syncytial relationship at the height of nematocyst 

 development. The double membranes in the cytoplasm have increased in 

 amount and are very conspicuous in the cell. 



14 



