Freshwater Algse of S. of England. By W. & G. S. West. 509 
Genus Tetrapedia Reinsch. 
1. T. Beinschiana Arch. I. Ep. II. Wh. III. M., Mp., Rp., 
Th. Y. Go. 
Genus Go mphosphseria Kiitz. 
1. G. aponina Kiitz. III. Fg., Th. IY. Ks. Y. Go. 
Genus Clathrocystis Henfrey. 
1. G. aeruginosa (Kiitz.) Henfrey. III. Fg. 
Genus Polycystis Kiitz. 
1. P. marginata (Menegh.) Richter. II. U. III. Mp. 
*2. P. elahens (Breb.) Kiitz. YI. N. 
*3. P.flos-aguse Wittr. III. Th. YI.N. 
Genus Aphanooapsa Nag. 
1. A. pulchra (Kiitz.) Rabenh. III. Th. 
Genus Porphyridium Nag. 
1. P. omentum (Ag.) Nag. III. Clapham, Esher. 
Genus Chroococcus Nag. 
1. C. minor (Kutz.) Nag. III. C., Th. 1Y. Ks. VII. D. 
VIII. L., W. 
2. C. cohserens (Breb.) Nag. III. Dj. YI. N. VIII. H. 
3. C. turgidus (Kiitz.) Nag. I. Ep. III. C., Ew., Th. IY. Ks. 
VIII. K, T. 
4. G. pallidus Nag. III. Th. 
5. G. rufescens (Breb.) Nag. VIII. W. 
Summary. 
Genera. Species.* 
Class FLORIDEiE. 
Fam. Batrachospermese . 1 2 
Class CHLOROPHYCE^. 
Ord. Confervoideae Heterogamae. 
Fam. Goleocheetacese . . 1 3 
Fam. (Edogoniacese . . 2 21 
Ord. Siphoneae. 
Fam. Vaucheriaceae 1 6 
Fam. Hydrogastracese . 1 1 
* Excluding varieties and forms. 
