PLATE 9. Confervoidese. 



Figure 



1. Monostroma bullosum, Thuret. a, fragment of frond, with some cells empty ; 



b, ciliated zoospores from the cells ; c, zoospore germinating. 



2. Ulva Lactuca, L. a, fragment of frond ; 6, small ciliated zoospores from ditto. 



3. Ditto, a, fragment of frond ; b } ditto, with the cells nearly empty, showing the 



orifices by which the zoospores escape ; c, large zoospore ; d, zoospores ger- 

 minating. 



4. Enteromorpha claihrata, Grev. a, fragment of frond ; 6, zoospores from ditto ; 



c, the same in germination. 



5. Stigeoclonium protensum, Kiitz. a and 6, fragments of branched filaments, 



b, emitting zoospores, c, c ; c, germinating zoospores. 



6. Ulothrix mucosa, Thur. a, 6, fragments of filaments ; c, zoospores ; d, e, ditto 



germinating. 



7. CEdogonium vesicatum, Link, a, fragment of a filament ; 6, ditto, breaking up 



and emitting a zoospore ; c, zoospore with a crown of cilia ; d, e, germinating 

 zoospores ; /, membrane of a zoospore which has burst by a lid and discharged 

 small zoospores immediately after germination ; </, fragment of a filament with 

 one cell containing a resting-spore ; &, fragment of a filament in an abnormal 

 state, containing globular bodies ; i, germinating zoospore containing similar 

 globular bodies. 



8. Chcetophora elegans, Ag. 



9. A fragment of the same, emitting zoospores. 



10. Conferva cerea, Dillw. a, fragment of filament, one cell of which has discharged 



its contents in the form of zoospores, b. 



11. Conferva floccosa, Thur. a, filament breaking up; 6, fragment of growing 



filament ; c, zoospores. 



12. Rhizoclonium obttisangulum, Kiitz. 



13. Cladophora glomerata, Kiitz. a, filament with one fertile branch ; 6, apex of a 



fertile branch discharging zoospores, c. 



14. SpTiceroplea annulina, Kiitz. a, growing filament ; 6, filament with the con- 



tents converted into spores. 



15. Codium tomentosum, Ag. a, apex of clavate branch, with fertile cell ; b } zoo- 



spores. 



16. Staurocarpus gracilis, Hass. ; conjugating filaments. 



17. Spirogyra quinina, Kiitz. ; growing filament. 



18. Conjugating filaments, with spores. 



19. Ditto, with the spores germinating. 



20. Half-decomposed cell, with the contents converted into almost colourless bi- 



ciliated zoospores. 



21. Spore formed after conjugation. 



22. The same shortly before germination. 



23. A similar spore, with the contents converted into globular bodies. 



24. a and 6, portions of a Spirogyra ? with the contents converted into spiny 



globular bodies. 



25. Spirogyra quinina, Kiitz. ; imperfectly conjugated celJs, with the contents con- 



verted into globular bodies. 



26. Spirogyra nitida ; cell with nucleus, n. 



27. Spirogyra pellucida, Kiitz. ; cell with nucleus, w, and gelatinous outer coat, s. 



28. Spirogyra nitida, Kiitz., half-decayed, the contents partly changed into globular 



