116 
NEW BRITISH FRESH WATER ALGJS. 
Mougeotia elegantula. Wittr. Om. Ootl. Sotv. Alg. 40, t. 3,f. 5-8. 
West p. 112. 
Vegetative cells 4-4^- p diam., 15 to 30 times as long, copulat- 
ing cells knee-shaped ; spores 20-24 p long and broad, 12-14 p 
thick, cruciform, quadrate in front view, sub-elliptic with truncate 
apex in side view, mesospore hyaline, even, in front view quadrate, 
with angles a little rounded, side view oval. 
Form, microspora. West Linn. Journ. t. 18, /. 17. 
Vegetative cell 4 p thick, 16 times as long. Spore 18 p. 
Creggan Lough. 
Zygnema leiospermum. DBary. Coolce F. W. Algce 82. 
Form, minor. West in Finn. Journ. 
Sterile cells and zygospores smaller. Vegetative cell 16-17 p 
broad, 2-2 \ times longer. Zygospore 20-23 p. 
Cloonee Lough. 
Form, megaspora. West in Linn. Journ. 
Veg. cell, 27-28 p thick, 2-3 times longer. Zygospore 40-45 
p diam. 
Lough Shindilla. 
Zygogonium momonien.se. West Linn. Journ. 114, t. 24, f. 26. 
Sterile cells 1^-2 times as long as broad, connective tube much 
inflated ; zygospores broadly elliptical (the long axis parallel to 
the filaments), membrane smooth. 
Size. Veg. cell, 20-22 p broad ; zygospore, 30-33x25-27 p. 
Castletown. 
This species differs from Z. Kalfsii in its larger size, its shorter 
sterile cells, and its much larger, differently shaped zygospores. 
Staurogenia heterocantha. Nord. in Wittr. et Ford. Alg. Exs. 451. 
West p. 189. Toni Syll. Alg. 656. 
Coenobium of four cells, rounded, or broadly ovate-obcordate, 
angles (external) rounded, furnished with a spine, spines unequal, 
one (right) long, the other (left) about one-half shorter. 
Size. Cells 4-8 p without spines, with long spines 14 p , short 
spines 8 p. 
Derry cl are Lough. 
Caelastrum verrucosum. Beinsch. Cont. Alg. et Fung. t. 13, f. 8. West 
p. 189. Toni Syll. Alg. 572. 
Coenobium spherical, composed of 8 to 16 cells, measuring 45- 
56 p diam. ; cells sphasrical, 11 p broad, membrane thick, 
externally covered with acute warts. 
Adrigole. 
Oocystis Nagelii. Br. in Babh. FI. Eur. Alg. in., 53. West p. 191. 
Toni Syll. Alg. 663. 
Families composed of 2 or 4 to 8 cells; cells rounded-ovoid or 
oblong before division, 30-40x 15-21 p ; membrane rather thick, 
not stratose. 
S. of Kenmare. 
