PLATE XLVI. 



FIG. 



1. PoRELLA CONCINNA, p. 323. 



2. - , var. a (BELLI), from a British speci- 



men. 



3. - , with ooecia, showing the central pore 



and the rib-like processes. 



4. . 



5. , with spatulate avicularia. 



6. - , var. a, from a Canadian specimen. 



* 



7. - , with a porous surface. 



8. , old state. 



9. - , var. fi (GRACILIS). 



10. - , with spatulate and normal avicularia. 



11-13. , vars. 



