39 
In connection with the above-named species of Avrainvilleas 
I may also mention a peculiar plant which I first took for an 
Åvrainvillea but later on have found may be like the F/abellaria 
luteofusca Crn., in Mazé et Schramm, Essai de Classification des 
Algues de la Guadeloupe, p. 88. 
Through the great kindness of Dr. Bornet, in whose pos- 
session Herb. Thuret is and in which Herb. Crouan is incorporated, 
I have got for comparison with my plant the No. 1403 mentioned 
by Mazé et Schramm (l. c.) and which anatomically has shown 
itself quite to agree with my specimens. Murray (Catalogue of 
the marine Algæ of the West Indian Region, Journal of Botany 
vol. 27, p. 239) has referred this plant, though with a ?, to the 
genus Udotea and writes about it: "This very obscure form appears 
to me to be an imperfect state of an Udotea. Agardh, who had 
not seen a specimen (loc. cit. p. 76), says, "An potius Avrainvillea 
forma?” It is certainly not an Avrainvillea though it outwardly 
resembles one.” Finally Howe in his latest paper: Phycological 
Studies — III p. 513, gives a description of this species, which in 
all essentials seems to agree well with my plant, even if it, in a 
few points, shows some differences. 
I shall now firstly give a description of my plant. The single 
specimen found is preserved in formalin. Its colour is dark-green 
and most probably it has had nearly the same colour when living. 
The stipe (the rizome was wanting) is rather thin, about 4 mm. in 
diameter; it is cylindrical in the basal part, more flattened upward 
and passes evenly into the flabellum; the length of the stipe was 
in the present specimen 4 cm., between the stipe and the flabel- 
lum there was a broader flattened part on the side of which 
most probably side-branches have been present. The present fla- 
bellum is transversely suborbicular, 8 cm. broad and 5!/2 cm. high, 
entire, only with a little lacerated margin rather thin and mem- 
branaceous,. but of a rather thin texture reminding one of that 
in Udotea,. the surface being rather dense and glabrous; it is 
distinctly zonate. 
