WEBER-VAN BOSSE—MARINE ALG 283 
GLoropERMA, J. Agardh. 
1. GLOIODERMA (?) EXPANSA, n. sp. (Plate 18. figs. 28, 29.) 
Thallo membranaceo, plano, verisimiliter horizontaliter expanso, margine prolifera- 
tionibus in thallos juveniles excrescentibus. Thallo seepe anastomosante, constante 
e strato unico cellularum maximarum centralium, utroque latere duobus stratis 
cellularum parvarum et uno strata cellularum minimarum periphericarum cincto. 
Cystocarpiis et antheridiis ignotis ; tetrasporangiis in strato corticali parum mutato 
dispersis, cruciatis divisis. 
Saya de Malha, 53-55 fms. ; dry specimens. 
This alea seems to be new to science, and I have referred it to the family of the 
Rhodymeniacez on account of its large central cells placed in one series only. Its 
outward appearance recalls Rhodophyllis peltata, Grun., of the Tonga Archipelago, but 
it differs from that alga in having only one series of large central cells, whilst all species 
of Rhodophyllis have two series. Amongst the Rhodymeniacee it belongs, I think, to 
the genus Gloioderma, because it has very small peripheral cells and cruciate 
tetrasporangia scattered in the cortical layer, which is, nevertheless, very little 
changed. 
Unfortunately I have seen neither procarps, cystocarps, nor antheridia, and therefore 
the generic position of the alga remains uncertain. It needs to be further investigated, 
for it was gathered at a great depth (53-55 fms.), from which few Rhodophycee are 
known. 
By its broad, membranous, unbranched frond, which bears excrescences along its 
margin, and sometimes, though rarely, on the frond itself, this alga is easily distinguished 
from all other species of Gloioderma, as these have mostly a dichotomous or pinnate 
ramification. The entirely different mode of growth of the alga from Saya de Malha, 
and the great depth at which it was gathered, almost suggest that it may be the type of 
anew genus. 
CuHamptia, Desvaux. 
1. CHAMPIA COMPRESSA, Harv. 
Harvey, Genera South African Plants, ed. 1, p. 402, 
De Toni, Syll. Aig. vol. iv. sect. 11. p. 561. 
Amirante, 20-25 fms. ; small fragment, in alcohol. 
Coetivy, reef; dry specimen. 
Distribution. Cape of Good Hope; Ceylon; Malay Archipelago; Friendly Islands; | 
Australia (?) ; New Caledonia. 
2. CHAMPIA spec. 
Seychelles, Long Island, reef; dry specimen. 
A small specimen intermingled with Gelidiopsis variabilis. The simple main axis 
bears a few short branches, irregularly placed. Several main branches have grown 

