28 I 0LLIN8 \\D lil.i;\ Bl . 



DlCHOTHRDC Zanardini. 



l. OnrookB; filaments 15-20 m in branches of last order, l. D. Baaeriana. 

 1. Epiphytic; filamentc i in branches of last order. 2. D. faei 



*1. D. Batjebiana Bornel & Flahault, lss»i. p. 376. On rocks 

 between tides, North shore. Oct.. Nov., Bervev; Hamilton Harbor, 

 Now. Collins. Known heretofore only a- a fresh water species, but 

 the Bermuda plant is distinctly marine, though agreeing in characters 

 with European and American specimens from fresh water stations. 



2. I). rucicoLA Bornel «.V Flahault, 1886, p. 379; s huumphon 

 fucicola Kutzing, I s "" 52, p. 18, PI. LV, fig. II. On various ,•• 

 forming a mat at the bottom of a pool, Gibbet [sland, Hervey. 



PoLYTinux Zanardini. 



P. coRTMBOSAGrunow ex Bornetfc Flahault, L886,p.380; P. P.. -A.. 

 No. 1903; Microcoleus corymbostu Harvey, 1858, p. 109, PI. XLYIII. 

 B. Common on rocks between tides in quiet water all around the 

 islands. 



RlVULABIA Roth. 



P.. polyotis Bornet & Flahault, 1886a, p. 360; P. B.-A., Xo. L904; 



R. hosptia Bornet & Thuret, 1SS0, p. 168, PL XLL Rocks near high 

 water, South Shore, Feb., April, Collins; .urotto, Tucker's Town, 

 Dec, Hervey. 



Braciiytriciiia Zanardini. 



B. liACULANS (lomont, 1901, p. 127, PI. V, figs. E 7\ P. P. -A., 

 Xo. 2159. Forming a thin film on roots etc. of mangroves betv 

 tides, in company with Dichothrix and Ccrtothrix species, Fairyland, 



Dec.. ( "ollins. 



Originally described from material collected in Siam, this species 

 now makes it> second appearance half way round the globe. 



Family CRYPTOGLENACEAE. 

 ( Ibyptoglen v Ehrenl 



C. \mi.i:i«a\a B. M. Davis, L894,p. L01, PI. XI; P. P. -A., Xo. L851. 

 Among Cladophora expansa and other algae, in a brackish pool be- 

 tween Harrington Sound and the North Shore, April, Collins. 



