763 
Genus Asterionella Hassell. 
A. Bleakeleyii. (Sin.) Sand-washings, Yarmouth. 
A. ELEG^vNS. (Heiberg.) Sediment from water supply, Norwich. 
I have not detected any Diatoms in the water since the 
reservoirs have been covered over. 
A. FORMO.SA. Hass. Ormeshy Broad. In a pond on Mousehold 
Heath. 
Genus Synedra Ehrenberg. 
S. acicularis. (Sm.) Breydon. 
S. AFFiNis. (Kg.) Breydon; Scratby, growing on Chulophora 
rupesfris. 
S. AFFINIS var. TAnuLATA. Ditch near Vau.\hall Station, Yarmoutli. 
S. CAPiTATA. Ehr. Elordon, Ormosby, Whissonsett, Poringlaiul, 
Horning. 
S. DELiCATissiMA. (Sill.) Oriuesby. 
S. INVESTIENS. (Sm.) Growing on Cladophnm rnpestris, Scratby. 
S. -MiNUTissiMA. (Kg.) Whis.sonsott, Urmesby : rare. 
S. PULCiiELLA. (Kg.) Occurring in most salt and brackish-water 
localities. 
S. PULCiiELLA var. S.MiTiiii. Grim. Ditch near Yau.\hall Station, 
Yarmouth. 
S. RADIANS. (Sm.) Freixuent in fresh- water localities. 
S. RADIANS var. (Sm.) Elordon, Ormesby. 
S. ULNA. Ehr. Elordon, Ormesby, Whissonsett, roringland, 
Costessey. 
S. VAUCiiERiA. (Kg.) Ormesby. 
Genus Sceptroneis Ehrenberg. 
S. suDTiLis. (Grun.) Breydon. 
Genus Fragilaria Lyiigbye. 
E. CAPUCiNA. (Desm.) lleighani, Costessey, St Faith’s Newton. 
F. CONSTRUENS. (Elir.) var. binodis. Grun. Ormesby Broad. 
E. CONSTRUENS. (Elir.) Ormesby Broad. 
E. Harrisonii. (Sm.) Forma parva. Ormesby. 
E. MUTABiLis. (Sm.) Osier Car, Heigham; Hellesdon Bridge; 
Ormesby. 
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