A TREATISE 



ON THE 



BRITISH FRESHWATER 



BY 



G. S. WEST, M.A., A.R.C.S., F.L.S., 



PROFESSOR OF NATURAL HISTORY AT THE ROYAL AGRICULTURAL COLLEGE, 



CIRENCESTER ; FORMERLY SCHOLAR AND HUTCH1NSON RESEARCH 



STUDENT OF ST JOHN'S COLLEGE, CAMBRIDGE. 



ERRATA. 



3, line 19, for Glaucocystidae read Glaucocystideae. 

 14, last line, after Zygnemaceje insert a semicolon. 

 165, line 12, for E. ansatum Ehrenb. read E. ansatum Kalfs. 

 304, line 1, for Cymatopleura Turpin 1827, read Cymatopleura W. Sm. 

 1851. 



358 (Index), for Dabarya read Debarya. 



AT THE UNIVERSITY PRESS 

 1904 



