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Genus Rhipidophora Kutzing. 
E. abbreviata. Iviitz. Growing on sea- weed attached to a buoy 
at Scratby. 
Genus Eucampia Ehrenberg. 
E. zodiac ds. Ehr. Stomachs of Noctilucie, Yarmouth— rare. 
E. britannicus. (Sm.) Found with above — very rare. 
Family III— DIATOMA. 
Genus Diatoma Decandolle. 
D. vdlgare. (Bory.) Rare — in a gathering from Poringland. 
D. elongatum. (Ag.) In water supplied by “ Norwich Water 
Company.” 
D. grande. (Sm.) Rare — in gatherings from Ormesby. 
Genus Odontidium Kutzing. 
O. mutabile. (Sm.) Common — in gatherings from Horning Fen; 
Osier Car, Heigham ; Hellesdon Bridge ; Ormesby Broad. 
0. tabellaria. (Sm.) Associated with the above. 
O. parasiticuai. (Sm.) Growing on Nitzschia signioidea, Ormesby 
Broad. 
Genus Fragilaria Lyngbye. 
F. capucina. (Desm.) Frequent in fresh water ditches. 
F. virescens. (Ralfs.) Found in the same localities as the above 
species. 
F. tenuicollis. (Heiberg.) Ormesby Broad. 
Genus Synedra Ehrenberg. 
S. radians. (Sm.) Abundant in fresh-water gatherings. 
S. radians var. (Sm.) Flordon Fen ; Ormesby ditches. 
S. ulna. Ehr. Common — Whissonsett, Cossey, Horning, 
Heigham. 
S. capitata. Ehr. Common — Flordon, Ormesby, Whissonsett, 
Poringland, Horning. 
S. acicularis. (Sm.) Breydon ditches. 
S. minutissima. (Kiitz.) Rare — Whissonsett, Ormesby. 
