THE ALGAE OF BERMUDA. 33 



2. Cells 5-7 M diam. 2. E. minima. 



3. Fronds simple or with a few proliferations. 4. 



3. Fronds more or less branched. 5. 



4. Fronds inflated and flexuous. 5. E. flexuosa. 



4. Fronds compressed-filiform. 3. E. marginata. 



5. Branches largely monosiphonous. 1. E. plumosa. 



5. Branches not monosiphonous, except occasional proliferations. 



4. E. prolifera. 



1. E. PLUMOSA Kiitzing, 1843, p. 300, PI. XX, fig. 1; Collins, 1909, 

 p. 198; Borgesen, 1913, p. 7; P. B.-A., No. 2065; E. Hopkirkii 

 Yickers, 1908, PI. V. Rein, as E. percursa; North Shore, Jan., 

 Gibbet Island, Feb., March, Devonshire Bay, Feb., Harris Bay, 

 March, Kerrey; Tucker's Town, Harrington Sound, Shelly Bay, 

 April, Hungry Bay, May, Inlet, Aug., Collins. The most frequent 

 species of the genus here and quite distinct from our other forms, by 

 the rather large, longitudinally seriate cells, and the many branches 

 of a few series or a single series of cells. Sometimes long, subsimple 

 branches occur, of two series of cells, much resembling E. percursa 

 (Ag.) J. Ag, with which a plant of this kind was identified by Rein. 

 It is the E. plumosa of Borgesen, the E. Hopkirkii of Vickers, as shown 

 by authentic specimens; whether the plants passing under these 

 names in the North Atlantic are identical with this and with each 

 other may be questioned. If there should prove to be two species, 

 an examination of original specimens would be needed to decide what 

 names to use. 



2. E. MINIMA Nageli hi Kiitzing, 1849, p. 482; 1856, p. 16, PI. 

 XLIII, fig. 3; Collins, 1909, p. 201; P. B.-A., No. 2005. Grasmere, 

 March, Hervey; on old fish car, Hungry Bay, April, in drip from 

 outlet of aquarium, Agar's Island, Aug., Collins. 



3. E. MARGINATA J. G. Agardh, 1842, p. 16; Kiitzing, 1856, p. 15, 

 PI. XLI, fig. 1; Collins, 1909, p. 202. On old Sargassum, below 

 Flatts Bridge, May, Collins. 



4. E. PROLIFERA (Fl. Dan.) J. G. Agardh, 1882, p. 129, PI. IV, 

 figs. 103-104; Collins, 1909, p. 202; Ulva prolifera Flora Danica, 

 Vol. V, p. 5, PI. DCCLXIII, 1782. Rein, as E. comprcssa. Rein's 

 specimen is the only one of the species that we have seen from Ber- 

 muda, but it may be not uncommon. Little branched forms might 

 easily be mistaken for E. minima or E. flexuosa, until examined micro- 

 scopically. 



5. E. FLEXUOSA (Wulf.) J. G. Agardh, 1882, p. 126; Collins, 1909, 

 p. 203; P. B.-A., No. 2004; Conferva flexuosa Wulfen, 1803, p. 15. 

 Miss Peniston; Harrington Sound, Feb., Dec., Devonshire Bay, Feb., 



