PLATE XXVIII. 



FIG. 



1. MiCROPORELLA CILIATA, p. 206. 



2. — — , granular var. witli 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. 



y, 10. MlCKOPORELLA MaLUSII, p. 211. 



See Plate XXIX. %. 12. 

 11. , var. (3 (vitrea). 



