Norman, on Diatomacem. 
69 
N. Smithii, var. f5,fuscay Greg. — Ascidians. 
N. Smithii, var. y, nitescens, Greg. — Ascidiaus. 
N. gasty^oides, Greg. — Scarce. Small ditch near Stoneferry. 
N. minutula, Sm. — Not unfrequent in brackish water. Stone- 
ferry. Ditch near River Hull. Humber Bank. Marsh 
Chapel. Tetney. 
N. Jennerii, Sm. — Not unfrequent in salt and brackish water. 
Humber, near Stallingbro^, covering the mud for miles. 
River Hull, Stoneferry. Marsh Chapel. Dairycoats. 
Grimsby. 
N. Westii, Sm. — Rare in brackish water. River Hull. 
Stallingbro\ 
N. elegans, Sm. Local in brackish water. Very copious in 
a stinking marsh Tetney. Small ditch near River Hull, 
beyond Stoneferry. 
N. palpebraliSj Breb. — Rare. Mr. Robt. Harrison vide 
Smithes Synopsis. South Humber Bank, Dr. Munroe. 
N. Semen, Kiitz. — Local. Not unfrequent in the Hornsea 
Peat Deposit. Cottingham. Risby Pond. 
iV. affinis, ^hr. — Rare. Spring Ditch. Stream at Cottingham. 
N. inflata, Kiitz. — Not unfrequent in fresh- water gatherings. 
Wawne. Killinghall. Market Weighton Canal. Bever- 
ley Parks. Frequent in Cottingham gatherings. 
N. gibberula, Kiitz. — Frequent in fresh and brackish water. 
Risby Pond. Skirl augh. Nettleton. Cottingham. 
Hornsea Meer. Hornsea Deposit. Copious in a brackish 
marsh, Tetney. Ditch near River Hull, above Stoneferry. 
Wawne. Haltenprice. Spring Ditch. Market Weighton 
Canal. 
N. amphirhynchus, Ehr. — Not uncommon, though always 
much mixed. Nettleton. Cottingham. Skirlaugh. 
Harrogate. 
N. producta, Sm. — Not uncommon, though always sparse. 
Boggy place, Skirlaugh. Springs near Cottingham. Hal- 
tenprice. Peat Deposit, Hornsea. 
N. ambigua, Ehr. — Rare. Ditch near Stoneferry, leading to 
Sutton. Hornsea Peat Deposit. 
N. Amphisbmna, Bory. — Very frequent both in fresh and 
brackish water. Copious in a ditch near Stoneferry. 
Nettleton. Humber Bank. Cottingham. Marsh Chapel. 
Tetney. Copious near Harrogate. Ripley. Halten- 
price. Market Weighton Canal. 
N. sphcerophora, Kiitz. — Rare in fresh water. Haltenprice. 
Nettleton. Hornsea Peat Deposit. 
N. lumens, Sm. — Local in brackish water. Stinking marsh 
at Tetney. Ditch near River Hull, above Stoneferry. 
