THE ALGAE OF BERMUDA. 85 



record of them. Tufts of hairs were common; the cells in a definite 

 rectanijular region divide, four cells from an original cortical cell, 

 and each of these cells grows out into a hair; the hairs are contracted 

 at base, lower cells about as long as their diameter, moniliform, with 

 rich contents; upper cells 5-6 diam. long, cylindrical, nearly empty. 

 It does not seem to us that the distinction made by J. G. Agardh 

 between <S. Schroederi and S. Areschougii can be maintained. Ber- 

 muda specimens show the forms of frond and characters of dentation 

 characteristic of both species, as well as intermediate gradations. 



ZoNARiA Draparnaud. 



1. Frond rounded, little divided; mostly dorsiventral and prostrate. 



1. Z. variegata. 

 1. Frond erect, with many deep and narrow divisions. 2. Z. lobata. 



1. Z. VARIEGATA (Lamour.) Mertens in Martins, 1826, p. 21 ; 1827, 

 p. 6, PI. II, fig. 2; Vickers, 1905, p. 58; 1908, PI. VI. B; Borgesen, 

 1914, p. 197, figs. 151-152; Bidyota variegata Lamouroux, 1813, p. 57, 

 PI. V, figs. 7-9. Kemp, including some specimens marked Z. lobata; 

 Wadsworth, No. 6; Moseley, from shallow water down to 31 fathoms; 

 Hamilton Harbor, Agar's Cave, Jan., Walsingham, Feb., Farlow; 

 Gravelly Bay, Jan., Harrington Sound, Feb., Harris Bay, Jan., Nov.; 

 Inlet, Dec, Hervey; Ely's Harbor, Aug., Collins. Common nearly 

 ever\-w^here. It is sometimes found with one side of the lamina quite 

 firmly attached; sometimes the frond is quite free, with little differ- 

 ence between the two sides; these differences do not seem to depend 

 on the depth of water. Dickie^ 1874, p. 311, notes that the plants 

 dredged in 31 fathoms were mostly bluish green in color. 



2. Z. LOBATA Agardh, 1824, p.^265; Harvey, 1852, p. 105, PI. VII. 

 C; Vickers, 1905, p. 58; 1908, PI. VI; Borgesen, 1914, p. 199; P. B.-A., 

 No. 1876. Kemp; Tucker, No. 5; South Beach, near Paget, Farlow; 

 Wadsworth, No. 11; Inlet, Jan., Dec, Gravelly Bay, Feb., March, 

 Dec, Hervey; Gravelly Bay, July, Aug., Ely's Harbor, Hungry Bay, 

 July, Cooper's Island, Aug., Collins. Young plants are common 

 in Dec; by the last of Jan. good sized plants are common, and the 

 plants continue in good condition till May; after that, only old, bat- 

 tered fronds are to be found. It is common in quiet water as well as 

 on exposed shores. The best locality we observed was at Gravelly 

 Bay, where it grew in great tufts in pools and on rocks at low water 

 mark. The color varies from light to dark broum, the substance from 



