Clare Island Survey — Fresh-water Algae. 16 41 



*Aphanocapsa rivularis (Caiim.j Eabenh. — M. 



virescens (Hass.) Eabenh. — SL, 6 - 6 — 8/1 broad. 

 *Aphanothece conferta P. Bicht.— C, colonies 35-70ii, 2-2-5 x 3-4/<. 



microscopica Nag.— SL ; LG, 3-5-4 x 6-7ju ; VL, B ; C, 3 -3-4/1 x 7-5-8/1, 



also in brackish water, 3-3 x 7-9/i. 

 saxicola Nag.— DL, 2-5 x l-2/i ; W, L ; S, 2 x l/i. 



*stagnina (Spreng.) A. Br. — C, 3'3-3 - 5 x 5-6-7/1 ; associated and interlaced 

 with the tioating gelatinous mass was Lyngbya Rivulariarwm 

 in plenty. 

 *Microcystis elabens (Breb.) Kiitz. — C. 



*flrma (Breb. & Lenor.) Schmidle. — LG, colonies distinct, 20-30/u broad, 



cells circiter l/i broad ; DL, 1-1 -5ti broad. 

 *Flos-aquae (Wittr.) Kirchn.— CI, W. 

 incerta Lemm. — K ; S. W. of D, 2/i broad, sometimes slightly ovoid. 

 *ichthyoblabe Kiitz. — W, K. 

 marginata Menegh. — C. 



MINUTISSIMA sp. nov. — M. cellulis oblongis et eonfertis, aerugineis, post 

 divisionem subrotundatis, O-8-l/i latitudine (interdum l - 2/i), l'l— l*5ju 

 longitudine (interdum 2/i) ; familiis irregularibus in margine, circiter 

 40-140/1 (interdum majoribus), tegumento hyalino. Hah. — in loeis 

 paludosis libere natans. C, SL, VL. 

 stagnalis Lemm. — C, Mw ; SL ; S. W. of D, 1-5-1-8/t broad. 

 *Clathrocystis elongata W. & G. S. West. — DL. 

 Gomphosphaeria aponina Kiitz. — C, L, K. 



lacustris Chod. — Plankton of LG, 32-40/t broad usually, also among 

 . Bulbochaete attached to Lobelia Dortmanna. 

 Coelosphaerium kuetzingianum Nag. — C, M; plankton of EL and LG ; SL; 



L, in a small lake ; W, Cr. 

 Merismopedium aerugineum Breb. — D. 



elegans A. Br.— C, W ; SL, 6-6-6 x 7-Svh/. 



glaucum (Ehrenb.) Niig.— L, SL, C, M, IT, CP, I, SL, CI. W, VL, DL, 



Cr ; D, cells 4-5/* broad. 

 punctatum Meyen. — Cr, W. 



tenuissimum Lemm. — W; C, 1-6-2/t, in another gathering 0'7-0-Su ; 



Cr, 0'9-1/t, in another gathering 1 -2/<. 



Eucapsis alpina Clements & Schrautz. — Small tarn on Slievcmore. This plant 



has been recorded only once before, from a pond on a mountain in 



Colorado, and as no British publication contains it, I give a deserip- 



' tio'n:—" Colonies 30-80" mic. in diameter, usually containing 32-128 



cells, cubical, free-floating ; tegument colourless; cells 6-7 mic. in 



it. 1. A, proc, vol. xxxi. F 16 



