PLATE 5. Confervoidea. 



Figure 



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



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



2. Ulva Lactuca, L. 0, fragment of frond ; b, 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 clathrata, Grev. , fragment of frond ; b, zoospores from ditto; 



c, the same in germination. 



5. Stiff eoclonium protensum, Kiitz. a and b, fragments of branched filaments, 



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



6. Vlothrix mucosa, Thur. a, 5, fragments of filaments ; c, zoospores ; d, e, ditto 



germinating. 



7. (Edogonium vesicatum, Link. , fragment of a filament ; b, ditto, breaking up 



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

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

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

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

 state, containing globular bodies ; i t germinated zoospore containing similar 

 globular bodies. 



8. Chcetophora elegans, Ag. 



9. A fragment of the same, emitting zoospores. 



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



its contents in the form of zoospores, b. 



1 1 . Conferva floccosa, Thur. a, filament breaking up ; 6, fragment of growing 



filament ; c, zoospores. 



12. Rhizoclonium obtusangulum, Kiitz. 



13. Cladophora fflomerata, Kiitz. a, filament with one fertile branch; b, apex of a 



fertile branch discharging zoospores, c. 



14. Spheeroplea annulina, Kiitz. a, growing filament ; b, 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. 

 17-23. Spirogyra quinina, Kiitz.; 1 7, 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 b, Spirogyra ? with the contents converted into spiny globular 



bodies. 



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



verted into globular bodies. 



26. Spirogyra nitida; cell with nucleus, n. 



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



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



masses. 



