444 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
21. DICTYOTA DICHOTOMA, J. Ag. 
Tella Tella Kebira. 
22. SPHACELARIA RIGIDA, Аёс. 
An epiphyte on several Sargassa. 
23. ECTOCARPUS SILICULOSUS, J. Ag. 
Suez Day, Suakim. 
24. CASTAGNEA VIRESCENS, Thur. 
Suez Day. Suakim. 
RHODOPHYCE. 
25. LAURENCIA PINNATIFIDA, J. Ag. 
Suez Day. Recorded by Portier from Hodeida. 
26. LAURENCIA DIVARICATA, J. Ag. 
Suez Bay. Recorded by Zanardini from Suez, and by Hauck from 
Madagascar and the Somaliland Coast, 
27. LAURENCIA PAPILLOSA, Grev, 
Suakim. Recorded also by Piccone from Massaua and the Assab Archi- 
pelago and by Hauck from the Somaliland Coast, and by Zanardini from 
Suez, Tor, Djedda, &c. 
98. GELIDIUM RIGIDUM, Grev. 
Trinkitat. Recorded from the Red Sea by Zanardini, from Massaua and 
the Assab Archipelago by Piecone, and by Hauck from the Zanzibar Coast. 
29. GELIDIUM CORNEUM, Aütz. 
А form of this species occurs among the collection obtained at Trinkitat, 
which appears to be near Piecone's var. ambiguum. 
30. POLYZONIA JUNGERMANNIOIDES, J. Ag. 
On Sargassum dentifolium, but fragmentary. 
31, Hyprma VALENTIA, J. Ag. 
Trinkitat and Suez Bay. 
32. SPYRIDIA FILAMENTOSA, J. Дф. 
Suez Bay. Recorded also by Zanardini from the same locality, and also 
from Akaba and Kosseir. 
