PLATE XLII. 



FIG 



l'. ScHizopoiiELLAsiNUOsA, p. 266; Avith the peristome 

 slightly developed. 



2, , var. a (armata). 



3 ^ with numerous large foramina, and ooecia 



showing the central pore. 



4. , tessellated var. 



5. 



6 . ^ a young cell showing the primary orifice. 



7. Smittia cheilostoma, p. 349 ; with ooecia. 



8. 



9. Smittia BELLA, p. 353. After Busk. 

 10. , with ooecium. Ditto. 



