PLATE XXII. 



Fig. 1. Udotea flabellata Lamouroux, natural size. 



Fig. 2. Udotea flabellata Lamouroux, edge of frond, magnified. 



Fig. 3. Udotea flabellata Lamouroux, portion magnified. 



Fig. 4. Udotea flabellata Lamouroux, surface of frond, magnified. 



Fig. 5. Halimeda tridens var. incrassata Lamouroux, natural size. 



Fig. 6. Halimeda tridens var. incrassata Lamouroux, profile view of terminal segments. 



Fig. 7. Halimeda tridens var. incrassata Lamouroux, segments magnified. 



Figs. 8, 9. Halimeda tridens var. incras.sata Lamouroux, end view of terminal segments, magnified. 



