THE ALGAE OF BERMUDA. 73 



Harris Bay, March, Hervey. The species is a native of Australia, 

 but has been found at Martinique and at Barbados; in both these 

 places it was in company with S. tribuloides, as at Bermuda. It is 

 a stouter plant than the latter, and the technical difference, though 

 not striking, seems to be constant. 



FAMILY ENCOELIACEAE. 

 COLPOMENIA Derbes & Solier. 



C. SINUOSA (Roth) Derbes & Solier, 1856, p. 11, PI. XXII, figs. 18- 

 20; Borgesen, 1914, p. 176, fig. 138; P. B.-A., No. 2024; Uhasinuosa 

 Roth, 1806, p. 327, PI. XII, fig. 2. Rein; Moseley; Kemp, as Aspero- 

 coccus sinuosus; Gibbet Island, Tucker's Town, Gravelly Bay, Har- 

 rington Sound, Feb., Hungry Bay, April, Hervey. Very common 

 from Feb. to April, disappearing entirely in July and August, and at 

 least the first part of September. On exposed shores it forms a nearly 

 continuous coating, firmly adherent to the rock; in quiet water, 

 such as the tidal stream at Hungry Bay, it takes the form of sub- 

 spherical vesicles, up to 20 cm. diam. 



HYDROCLATHRUS Bory. 



H. CANCELLATUS Bory, 1825, p. 419; Vickers, 1908, PL XXIII; 

 Borgesen, 1914, p. 177, fig. 139; P. B.-A., No. 2078. Spanish Rock, 

 March, April, Hervey. Apparently not common. 



SCYTOSIPHON Agardh. 



S. LOMENTARIA (Lyng.) J. G. Agardh, 1848, p. 126; P. B.-A., No. 

 2079; Chorda Lomentaria Lyngbye, 1819, p. 74, PI. XVIII. E. Inlet, 

 Feb., Dec., Bailey's Bay, Jan., Mangrove Bay, Feb., Hervey. Ap- 

 pears to be a plant of winter and early spring, varying in different 

 years as to date of appearance, in some years not appearing at all at a 

 station where it was plenty the year before. It is a rapid grower, 

 and disappears soon after maturity. 



