PLATE XVI. 



Fig. i, 2, 5. Amphiroa fragilissima Lamx. 



Fig. 1. Large specimen from Banda. nat. size. 



Fig. 2. Young node which begins to develop itself. 30 /, 



Fig. 5. Full-grown node. 



13; 



Ir 



Fig. 3, 4. Amphiroa anastomosans n. sp. 



Fig. 3. Fronds in nat. size. 



Fig. 4. Fronds enlarged 30 /,. 

 Fig. 6 — 8. Amphiroa anceps (Lamk.) Dec. 



Fig. 6. Frond nat. size. 



Fig. 7. Young node :i "/,. 



Fig. 8. Older node quite developed 30 /,. 

 Fig. 9 — 12. Amphiroa canaliculata v. Mart. 



Fig. 9. Growing top of frond '°/,. 



Fig. 10. Frond upperside. nat. size. 



Fig. 11. Frond underside. nat. size. 



Fig. 12. Three transversal sections through frond. nat. size. 

 Fig. 13. Amphiroa rigida f. divaricata. nat. size. 



Fig. 14. Longitudinal section through joint and node of Amphiroa verrucosa Kütz. (A. cryptarthrodia Zan.j. '°/,. 

 Fig. 15. Corallina officinalis Linn. "/,. 

 Fig. 16. Jania rubens Linn. Longitudinal section through joint and node. The horizontal lines marking the 



rows of cells are too straight. They ought to have been more like what one sees in fig. 18. '" ,. 

 Fig. 17. Part of a section of a fossil Amphiroa spec. (fragilissima?) from Totok Celebes. ' 5 j l . 

 Fig. 18. Part of a section of a fossil Jania from the mountain Nona at Ambon. "° ,. 

 Fig. 19. Longitudinal section through a type specimen of Amphiroa fragilissima Lamx. "/,. 



