28 COLLIXS AND HERVET. 



DiCHOTHEix Zanardini. 



1. On rocks; fflaments 15-20 yL in branches of last order. 1. D. Baueriana. 

 1. Epiphytic; filaments 20-30 n in branches of last order. 2. D. fucicola. 



*1. D. Baueriaxa Bornet & Flahault, 1886, p. 376. On rocks 

 between tides, Xorth Shore, Oct., Nov., Hervey; Hamilton Harbor, 

 Nov., Collins. Known heretofore only as 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. D. FUCICOLA Bomet & Flahault, 1886, p. 379; Schizosiphon 

 fucicola Kiitzing, 1850-52, p. 18, PI. LV, fig. H. On various aJgae 

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



PoLTTHErx Zanardini. 



P. coETAiBOSA Grunow ex Bomet & Flahault, 1886, p. 380; P. B.-A., 

 Xo. 1903; Microcolens corymbosits Harvey, 1858, p. 109, PL XLVIH. 

 B. CoDxmon on rocks between tides in quiet water aU around the 

 islands. 



RlVULAEIA Roth. 



R. POLTOTis Bomet & Flahault, 1886a, p. 360; P. B.-A., No. 1904; 

 R. hospita Bomet & Thuret, 1880, p. 168, PL XLI. Rocks near high 

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

 Dec, Hervey. 



Brachttrichta Zanardini. 



B. MACULANS Gomont, 1901, p. 127, PL V, figs. 5-7; P. B.-A., 

 No. 2159. Forming a thin film on roots etc. of m^angroves between 

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

 Dec, Collins. 



Originally described from material collected in Siam, this species 

 now makes its second appearance half way round the globe. 



FAiiiLT CRYPTOGLENACEAE. 

 Cbtptoglexa Ehrenberg. 



C. AiiEEiCAXA B. M. Davis, 1894, p. 101, PL XI; P. B.-A., No. 1851. 

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

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



