94 



and such walls occur also now and then in the filaments especi- 

 ally where they are divided. The walls always occur a little out 

 in the branches and the fdaments are most often somewhat slender 

 here. The walls are formed quite in the same manner as e. g. 

 is the case in Codiiim ; an annular thickening appears which by 

 and by grows thicker and at last quite closes the connection 

 between the two cell-parts. The walls are first formed in the 

 somewhat older thallus ; quite near the edge of the thallus they 

 are not yet found but the narrowings in the filaments are present 

 (Fig. 76rf). 



The cell wall of the plant is very thin. There is a great 

 number of quite small, oval or lens-shaped chromatophores ; any 

 pyrenoids I have not found in them. The assimilation product 

 is starch, which is found here and there as rather large oval bodies. 

 jMany nuclei are found in the protoplasm. 



This nice and as it seems very seldom plant was only found twice 

 in the Sound between St. Thomas and St. Jan: Off Crux Bay. It 

 was gathered in a depth of about 30 meters. 



Geogr. Distrib. Guadeloupe, St. Jan. 



Cladocephalus Howe. 



Cladocephahis hiteofusciis (Crouan) Borgs. 



BoRGESEN, F., The species of Avrainvilleas hitherto found on the shores 

 of the Danish West Indies (Vidensk. Medd. naturh. Foren., 1908, p. 39). 

 Gepp, a. & E. S., Marine Algse of the »Sealark« Expedition (Transac. Linn. 

 Soc, ser. 2, Bot., vol. VII (1908) and Zool. vol. XII, part 4, 1909). Gepp, 

 A. & E. S., The Godiaceae of the Siboga Expedition, Monographic LXII. 

 1911, p. 60. 



Flabellaria luteofusca Crouan, in Maze et Schramm, Essai de Classi- 

 fication des Algues de ia Guadeloupe, p. 88. 



Uclotea luteofusca Murray, in Journ. of Bot., 27, 1889 p. 239; Howe, 

 Phycological Studies III. (Bull. Torr. Bot. Club, 34, 1907, p. 513). 



Of this species only a single but large and well-developed 

 specimen has been found. It had a dark-green colour. The 

 stipe (the basal part was wanting) is rather thin, about 4 mm. 

 in diameter; it is cylindrical in the basal part, more flattened 

 upwards and passes evenly into the flabellum ; in the specimen 

 found the length of the stipe was about 4 cm., between the stipe 

 and the flabellum there was a broader flattened part, on the side 

 of which most probably some laterally placed flabella have been 

 present. The flabellum in the specimen found is transversely 

 suborbicular, 8 cm. broad and 514 cm. high, entire, only with a 



