Freshwater Algee of 8 . of England. By W. & G. S . West. 473 
*16. (E . lautumniarum Wittr. The spermogonia were about 8- 
celled, and the supporting cells of the oogonia a little inflated. 
II. Wh. 
Orel. Siphonese. 
Fam. Vaucheriacese. 
Genus Vaucheria DC. 
1. V. sericea Lyngb. II. Ki. 
2. V. aversa Hass. II. Ru. 
3. V. sessilis (Vauch.) DC. II. Ki. III. 31. VI. N. 
4. V. geminata (Vauch.) DC. III. C. IV. Ks. 
Var. racemosa Walz. III. B., F. 
5. V. hamata (Vauch.) Lyngb. II. Ki., Ru. 
6. V. terrestris Lyngb. IV. Brn. 
Fam. Hydrogastraceas. 
Genus Botrydium Wallr. 
1. B. granulatum (L.) Grey. III. Ew., July 1893 ; also Oct. 
1893, abundant. M. (L. A. Boodle ; 1892). 
Ord. Confervoidese Isogamse . 
Fam. Ulvaceae. 
Genus Monostroma Thur. 
1. M. bullosa (Roth) Wittr. III. M. (L. A. Boodle; 1891). 
Genus Prasiola A g. 
1. P. crispa (Lightf.) Ag. II. Bg., U. III. Kingston. IV. He. 
Fam. Ulotrichaceae. 
Sub-fam. Ulotriche^;. 
Genus Hormidium Kiitz. 
1. H. murale (Lyngb.) Kiitz. ( TJlothrix radicans Kiitz.). I. Ep. 
III. Wi. 
2. H. parietinum (Vauch.) Kiitz. ( U loti mix parietina Kiitz.). 
I. Ep. II. Pi. III. Esher. Frensham, Kingston, Wi. 
IV. Bm. 
Genus Hormiseia Fries ; Aresch. 
*1. H. subtilis (Kiitz.) De Toni. IV. He. 
Var. variabilis (Kiitz.) Kirchn. ( TJlothrix variabilis Kiitz.). 
I. Ep. II. Hy. III. Dj., E., Ew., Mp., Wi. IV. Cb., 
Ks. V. Go. 
Var. tenerrima (Kiitz.) Kirchn. ( TJlothrix tenerrima Kiitz.). 
I. Ep. II. Ru. III. E., Rp., Wi. 
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