PLATE XXVIII, 



PIG. 



1. MlCROPORELLA CILIATA, p. 206. 



2. - , granular var. with normal avicularia. 



3. , primary cell. 



4. , dwarf var. 



5. , var. with umbo and areolated ovicell. 



6. , Australian var. 



7. , var. PERSON ATA. 



8. , two forms of avicularium. 



9, 10. MlCROPORELLA MALUSII, p. 211. 



See Plate XXIX. fig. 12. 

 11. - , var. /3 (VITREA). 



