300 PERCY SLADEN TRUST EXPEDITION 
k HALopLeGMA, Montagne. 
1. HatnorpreGmMa PREeEtsstiI, Sond. 
Sonder, Alg. Preiss. p. 24. 
Harvey, Phye. Austr. 1859, tab. 79. 
De Toni, Syll. Alg. vol. iv. sect. 111. 1903, p. 1366. 
Cargados Carajos, at 22, 30, and 47 fms.; both dry and in alcohol. 
Distribution. Western Australia ; Tasmania, in the River Tamar above Georgetown ; 
Malay Archipelago. 
The specimens of H. Preissvi from Cargados Carajos are shorter, less branched, and 
more flabellate than most plants found in the herbaria under that name. I have not 
ventured, however, to describe these specimens as new, for I have found no microscopic 
character to distinguish them from the type, the size of the main branches and the 
peripheral filaments being essentially the same in the different plants. The specimens 
from Cargados Carajos bear tetraspores; I have not seen cystocarps or antheridia, and 
it is possible that these may show differences in structure. Dr. Harvey, in his ‘“ Phye. 
Australica,” however, calls attention to the fact that the external form of H. Preissz is 
very variable. He found it growing in the River Tamar, a considerable distance above 
Georgetown, where it appeared at first to be a distinct species ; but he was able to trace 
it down to the Heads of Port Dalrymple, and found that it blended into the usual variety. 
I feel very much inclined to think that the specimens from Cargados Carajos owe their 
small size in great measure to the depth at which they were gathered. 
ANTITHAMNION, Naegeli. 
1. ANTITHAMNION ADNATUM, J. Ag. 
J. Agardh, Analecta algologica, 1892, p. 12. 
Chagos Archipelago, Salomon Atoll. 
Distribution. New Zealand; Malay Archipelago. 
A small specimen with tetraspores, attached to Herposiphonia. 
Spyripia, Harvey. 
1. SpyRIDIA FILAMENTOSA (Wulfen), Harv. 
Harvey in Hooker, Brit. Flora, vol. ii. p. 337 ; Phycol. Brit. 1871, pl. xlvi. 
Aldabra reef, outside Passe Houareau. 
Distribution. West Indies; Mediterranean; Red Sea; Indian Ocean; Malay 
Archipelago. 
Only a small fragment attached to Amphisbetema indica. 
CrrAmtum (Roth), Lyngbye. 
1. CERAMIUM CINNABARINUM (Gratel.), Hauck. 
Hauck, Die Meeresalgen von Deutschland, 1885, p. 112. 
Chagos Archipelago, Salomon Atoll. 
Distribution. Mediterranean; Malay Archipelago. 
A small specimen amongst other alge. 
