WEBER-VAN BOSSE—MARINE ALG 289 
Cuonpria, C. Agardh. 
1. CHonpRIA PUMILA, Vick. (Plate 16. fig. 8.) 
Vickers, “Liste des algues marines de la Barbade,’ in Ann. d. Sc. Nat. 9™¢ série, Bot. vol. i. 
p. 45. 
Chagos Archipelago, Diego Garcia, reef; in alcohol. 
Distribution. Barbados. 
On comparing the Chondria from the Chagos Archipelago with Ch. pumila, Vick. 
from Barbados, I could detect no character whereby to distinguish it. I conclude, 
therefore, that they belong to one species even though the distance between the two 
localities is very great; but perhaps this minute plant will be detected later in inter- 
vening localities. Miss Vickers intended to give a figure, but her untimely death 
prevented her from carrying out this intention. I have therefore given an illustration 
of the Chagos plant. . 
2. CHONDRIA SIMPLICIUSCULA, n. sp. (Plate 16. figs. 9, 10.) 
Thallo filiformi, repente, intricato, pauci ramoso ; ramis interdum oppositis, plerumque 
singulis; apice filorum truncato, cellulis apicalibus in fovea crateriformi 
immersis. Cellula centrali et quinque cellulis pericentralibus uno aut duobus 
stratis cellularum corticalium circumdatis. Cellulis periphericis desuper visis ad 
apicem hexagonalibus, in parte inferiore cum pariete undulata et ea re moniliformi. 
Organis fractificationis non visis. 
Aldabra, reef, on Laurencia papillosa. 
This small species is characterized by its filaments being mostly horizontally disposed, 
sparingly branched, and bearing the tetrasporangia not in special stichidia but at the 
apex of ordinary branches, which ultimately may grow out into long vegetative shoots 
when the formation of tetraspores has ceased. 
After having been dried Ch. simpliciuscula adhered firmly to the alga on which it had 
spread itself, but I detected no union between the two plants. It belongs to the section 
Celochondria, Falk., as is clearly shown by fig. 10 on PI. 16. 
PoLyYsIPHONTA, Greville. 
1. PoLYSIPHONIA spec. 
Praslin, reer, on Hypnea pannosa. 
A fragmentary specimen that 1 was unable to name. 
RoscHera, Sonder. 
1. RoscHERA GLOMERULATA (Ag.), n. comb. 
Tolypiocladia glomerulata, Schmitz, Marine Florid. von Deutsch Ost-Afrika, 1895, p. 160. 
Seychelles, Long Island ; dry specimen, fragment. 
Distribution. Zanzibar; Indian Ocean; Malay Archipelago. 
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