32 COLLINS AND HERVEY. 



at the entrance to Hungry Bay, April, Collins. The typical form of 

 this species is a fresh water plant from Barbados, described and 

 figured as Hormospora scalariformis by G. S. West, 1904a, p. 282, PI. 

 CCCCLXIV, figs. 6-7. In the Bermuda plant the cells are some- 

 times longer in proportion to the diameter, and the wall of the fila- 

 ment shows no differentiated portion about the individual cell. It is 

 probable that Hormotrichum bermudianum Harvey is the same plant, 

 but the specimens of the latter cannot be found. Rein, 1873, p. 153, 

 gives this name as Harvey, sp. n. Dr. Mobiu's has kindly looked for 

 it in the collection at Frankfort, and was unable to find it. Professor 

 Dixon of the University of Dublin tells us that he cannot find it in the 

 Harvey herbarium. The no men nudum cannot of course stand against 

 West's name, but it would be of interest to recover the material. 



STICHOCOCCUS Nageli. 



*S. SUBTILIS (Kiitz.) Klercker, 1896, p. 103; Hazen, 1902, p. 162, 

 PI. XXI, figs. 10-13; Collins, 1909, p. 191; Ulothrix subtilis Kiitzing, 

 1845, p. 197. Among other algae, in a ditch in South Shore marshes, 

 Aug., Collins. Straight filaments a few cells long, scattered among 

 Spirogyra, Rhizoclonium etc. 



MICROSPORA Thuret. 



1. Cells thick-walled, 20 n or more diam. 1. M. Wittrockii. 



1. Cells thin-walled, 11-14 A diam. 2. M. Willeana. 



*1. M. WITTROCKII (Wille) Lagerheim, 1887, p. 417; Hazen, 

 1902, p. 172, PI. XXIII, figs. 5-7; Collins, 1909, p. 193; P. B.-A., 

 No. 2066; Conferva Wittrockii Wille, 1887, p. 461, PL XVII, figs. 35- 

 41. Fresh water pool near Shark's Hole, Feb., Hervey. 



*2. M. WILLEANA Lagerheim in De Toni, 1889, p. 228; Hazen, 

 1902, p. 175, PL XXIV, figs. 5-7; Collins, 1909, p. 194. Among 

 Oedogonium etc. in ditch in Devonshire Marsh, April, Collins. 



FAMILY ULVACEAE. 

 ENTEROMORPHA Link. 



1. Cells not in longitudinal series except in the very youngest parts. 2. 



1. Cells mostly in longitudinal series. 3. 



2. Cells 10-20 M diam. 6. E. intestinalis. 



