PLATE LV. 



FIO. 



1. CELLEPORA DICHOTOMA, p. 403; adult zooecia. 



2. , younger cells from the margin of 



the colony. 



3-6. , nat. size, showing the varieties of 



habit. 



7. , var. ATTENUATA, rather young cells. 



8. } single cell and spatulate avicula- 



rium. 



9. , section of the stem. 



10. , nat. size. 



11,12,14. CELLEPORA COSTAZII, p. 411 ; normal form. 

 13. , var. a (TUBULOSA). 



