PLATE XXVII. 



FIG. 



1-4-. Membraniporella nitida, p. 200; various forms. 



5. , var. with small number of ribs. 



6. , primary cell. 



7. , group of cells in an early stage. 



8. , outline showing the structure of the 



cell. 



9. Membraniporella melolonthAj p. 202. 



10. , nat, size. 



