PLATE II. 



Figs. 15 — 18. Halimcda macrophysa. 



Fig. 15. Habit of plant. (Siboga-Exp.). Nat. size. 



Fig. 15». Portion of surface of joint. ■ 15. 



Fig. 16. Filaments of central strand; shewing mode of fusion, and origin of peripheral cells 



(p. p.) from the fused portion. 65. 

 Fig. 17. Peripheral cell, surface view. • 140. 

 Fig. 18. Peripheral cells, longitudinal view. x 140. 



Figs. 19 — 27. Halimeda O punt ia. 



Fig. 19. Forma typica. Nat. size. 



Fig. 20. Forma triloba. (China Sea, Herb. Mus. Paris, type of H. triloba Decaisne). Nat. size. 



Fig. 21. Forma cordata (Red Sea, Herb. Agardh. Type of H. cordata J. Ag.). Nat. size. 



Fig. 22. Forma Rcnschii. (Comoro Islands, authentic specimen). Nat. size. 



Fig. 22a. Forma Renschii. (Siboga-Exp.) shewing rounded joints. Nat. size. 



Fig. 23. (Plate III). Forma hederacea. (Siboga-Exp). Nat. size. 



Fig. 24. Forma elongata. (Siboga-Exp.). Nat. size. 



Fig. 25. Filaments of central strand, shewing mode of fusion • 65. 



Fig. 26. Peripheral cells, surface view. x 140. 



Fig. 27. Peripheral cells, longitudinal view. x 140. 



