162 
NoRMANj on Diatomacea. 
GoMPHONEMA, Agardh. 
G. capitatum, Ehr. — Not unfreqnent in fresh water. Cotting- 
ham. Peat deposit, Hornsea. Anlaby Road, Dr. 
Munroe. 
G. insigne, Greg. — Rare in fresh water. Springs, Newbald. 
G. constrictum, Ehr. — Very frequent in fresh water. Pond, 
Skirlaugh. Risby Pond. Beverley. Anlaby Road. 
Wawne. Harrogate. Cottingham. Hornsea Deposit. 
Market Weighton Canal. 
G. acuminatum, Ehr. — Frequent in fresh water. Driffield. 
Newsham Lake. Cottingham. "Wawne. Beverley. 
Reservoir Waterworks. 
G. dichotomum, Kiitz. — Not unfreqnent. Newbald. River 
Hull, Wawne. Market Weighton Canal. 
G. tenelluMy Sm. — Not unfreqent in fresh water. Ditch on 
the Road from Newland Toll Bar to Stoneferry. 
Driffield. Pond, Skirlaugh. Wall under a leaky tap. 
G. olivaceum, Ehr. — Frequent in fresh water. Pure at 
Benningholme. On Cladophora in the Reservoir Water- 
works. Cottingham Beck, very good. 
G. intricatum, Kiitz. — Not unfrequent in fresh water. Pond 
at Nettleton. Wawne. Ditch running from Anlaby to 
Hessle Road. River Derwent. Benningholme. 
G. Vibrio, Ehr. — Rare. River Hull at Wawne. 
G. curvatum, Kiitz. — Abundant, in fresh-water gatherings. 
Pure on Cladophora, Cottingham Beck. Reservoir 
Waterworks. Harrogate, pure. 
G. marinum, Sm. — Frequent in marine gatherings. Pure on 
Cladophora rupestris, Filey Bridge and Flambro' Head. 
Rhipidophora, Kiitzing. 
jR. abbreviata, Kiitz. — Local. Pure on Alga in a large pool 
of salt water near the Dock, Grimsby. 
R. tenella, Kiitz. — Pure on Cladophora, Filey Bridge. 
R. paradoxa, Kiitz. — In abundance on Cladophora, Flambro' 
Head. 
Meridion. Agardh. 
M. circulare, Ag. — Very abundant in clear fresh water. 
Spring at Haltenprice, copious. Springs at Cottingham. 
Market Weighton Canal. Very frequent near Cotting- 
ham. Very pure and abundant in a spring near the 
Trout stream at Driffield. 
M. " constrictum, Ralfs.— Rare. Spring Ditch," Dr. Munroe. 
