Freslnvater Algse of S. of England. By W. & G. S. West. 499 
Genus Coelastrum Nag. 
1. C. sphsericum Nag. Very frequent. 
2. C. microporum Nag. III. C., Ba, Bp. IV. He. 
3. G. cambricum Arch. IV. Ks. 
4. C. cubicum Nag. IY. Ks. 
5. C. verrucosum Beinsch. III. E. 
Genus Sorastrum Kiitz. 
1. S. spinulosum Nag. YI. N. YIII. H. 
*2. S. (?) simplex Wille. YIII. K. 
Genus Pediastrum Meyen. 
1. P. Boryanum (Turp.) Menegh. Common. 
Yar. granulatum (Kiitz.) A. Br. I. Ep. III. Fg, Mp. 
IY. Ks. YII. S. 
2. P. glanduliferum Bennett. III. Bi. 
Arms delicate, faintly rough, converging and often crossing 
one another ; diam. cell, periplier. 22-27 p. 
3. P. constrictum Hass. II. U. III. Ba., Bp. 
4. P. duplex Meyen (P. pertusum Kiitz.). II. Ha., Wh. III. 
Bi., C., FI, M, Pu., Ba., Bp., Wt. IY. Ks. 
5. P. integrum Nag. III. Eg., Pu. " 
6. P. angulosum (Ehrenb.) Menegh. III. Ba., Wt. 
7. P. tetras (Ehrenb.) Balfs. I. Ep. II. U. III. Bi., FI., Mp, 
Pu, Ba. IY. He. Ks. Y. Go. YI. N. YII. D, S. 
YIII. G. 
Genus Crucigenict Morren. 
1. C. rectangidaris (Nag.) A. Br. HI. Bi, Mp, Ba. Y. Go. 
YII. S. YIII. H„ K, L. 
This was noticed from Frensharu, Surrey, with families of 128 
cells. 
Sub-fam. Pseudoccenobie^:. 
Genus Sciadium A. Br. 
1. S. Arbuscula A. Br. I. Ep. II. Ha. III. B, M, Wi. 
IY. He, Ks. 
Abundant on Wimbledon Common, Surrey, in the autumn of 
1892, and again in the autumn of 1891. Also exceptionally fine 
from a pond on Hayes Common, Kent. 
Genus Ophiocytium Nag. 
1. 0. cochleare (Eich.) A. Br. General. 
2. 0. magus Nag. III. E, Mp. 
Genus Mischococcus Nag. 
1. M. confervicola Nag. II. Bu. 
