NoRMANj on Diatomacede, 
61 
E. MusculuSj Kiitz. — Not imcommon. Brackish marshy Tet- 
ney Lock. Timber Pond, Victoria Dock. Ditch near 
Stoneferry. 
E. constricta, Sm. — Rare. Brackish marsh, Tetney Lock. 
Brackish Ditch near Stoneferry. North Humber Bank, 
Dr. Munroe. 
E. gibba, Kiitz. — Not unfrequent. Risby Pond. Driffield. 
Brackish pond near Tetney. 
E. ventricosa, Kiitz. — Not uncommon. Bisby Pond. Brack- 
ish marsh, Tetney Lock. Salt-water Ditch, Stallingbro\ 
River Hull, Wawne. Hornsea Peat. 
E. marina^ Donk.— Rare. Sands, Hornsea. 
Cymbella, Agardh. 
C. Ehrenbergii, Kiitz. — Not uncommon in fresh water. 
Hornsea Peat. Cottingham. Spring Ditch. 
C. cuspidata, Kiitz. — Not uncommon, but never abundant, 
Saltersgate. Harrogate. Frequent in gatherings, 
Cottingham. 
C. affinis, Kiitz. — Local. Abundant in a gathering near 
Harrogate. 
C. maculata, Kiitz. — Frequent. Pure, in a ditch running 
from Anlaby to Hessle Road. Beverley. Cottingham. 
Haltenprice. Reservoir Waterworks. 
C Helvetica, Kiitz. — Rare. Rocky stream, Saltersgate. Spring 
Ditch. Market Weighton Canal. 
C Scotica, Sm. — Rare. Rocky stream, Saltersgate. Ditch, 
Cottingham Road. 
C. ventricosa, Kiitz. — Not uncommon. Pond, Skirlaugh, 
Inglemire Lane, near Cottingham, pure. Benningholme. 
Amphora, Ehrenberg. 
A. ovalis, Kiitz. — Common in almost every fresh-water 
gathering ; more rarely in brackish water. 
A, affinis, Kutz. — Not unfrequent in brackish water. Ditch 
near Stoneferry. Humber Bank. Tetney. 
A. hyalina, Kiitz. — Frequent. Humber. Pure in a salt- 
water pool, Grimsby. 
A. salina, Sm. — Not unfrequent. Victoria Dock Timber 
Pond. River Hull, near Stoneferry. 
A. tenera, Sm. — Common in salt-water Pools and Ditches. 
Dairycoates under Railway arch. North Humber Bank, 
pure. River Hull, near Stoneferry. 
A. costata, Sm. — Rare. Behind the Garrison, Dr. Munroe. 
A. minutissima, Sm. — Fresh water. Cottingham. Beverlay 
Parks, near Woodmancy, Springs, Newbald, 
