THE ALGAE OF BERMUDA. 101 



suddenly to an acute point. Central strand about 150 ix diam., of 

 closely packed filaments, cells about 20 m diam., 4-8 diam. long; 

 fascicles of assimilative filaments 600-800 ix long, dense, even-topped, 

 making a continuous smooth surface to the frond; filaments many 

 times dichotomous, lower cells 5-7 ij, diam., 5-8 diam. long, subcylin- 

 drical; upper cells shorter, stouter, more ovoid; end cells 8-10/* 

 diam., 2-3 diam. long, occasionally with a short hair, about 4 m diam. 

 Fructification unknown. Cooper's Island, April, Hervey. 



The peripheral filaments do not arise directly from the cells of the 

 central strand; at the summit of one of these cells a short conical or 

 ovoid cell is formed, from which radiate the basal filaments of several 

 peripheral fascicles; these filaments are usually straight and un- 

 branched for 200^00 ju, then dichotomous. The substance is softer 

 than in L. vcdida, not as soft as in L. pukerulenta. The reference to 

 the genus lAagora is from the structural characters; we have found 

 no fruit. As is well known, the amount of calcification varies much in 

 the different species, but there is only one species recorded practically 

 free from lime, L. duhia (Bory) Bornet in De Toni, 1905, p. 1628; 

 Cladostephus duhius Bory, 1832, p. 331, PI. XXXVIIbis, fig. 6. 

 Little is known of this species beyond Bory's plate and description, 

 but it seems to be quite distinct from the present species. 



Family CHAETANGIACEAE. 

 SciNAiA Bivona. 



S. COMPLANATA (CoUins) Cotton, 1907, p. 260; Setchell, 1914, p. 

 100, PI. XI, figs. 19-22; S.furcellata var. complanata CoUins, P. B.-A., 

 No. 836; 1906, p. 110. Farlow. A single specimen in the Farlow 

 herbarium is the only representative of the species and genus that we 

 have seen from Bermuda; as the segregation of the forms till recently 

 included under S. furcellata has only just been made, it is impossible 

 to locate the S. furcellata recorded by Moseley, " a single specimen 

 dredged." 



Galaxaura Lamouroux. 



Representatives of this genus are common all around the islands, 

 but the distinguishing of species is very difficult. We note below five 

 species in regard to which we feel some confidence, but we have many 



