66 
Norman, on Diatomacece. 
C. apiculata, Sm. — Rare. Cottingham. Skirlaugh. Clay 
Pits, Nettleton. 
C. elliptica, Sm. — Very common in fresh-water ditches. 
Eisby Pond. Wawne. Haltenprice. Peat Deposit, 
Hornsea. Cottingham. Beverley. Market Weighton 
Canal. Spring Ditch. 
NiTzscHiA, Hassall. 
N. sigmoidea, Sm. — Very frequent in fresh clear water ditches. 
Cottingham. Risby Pond. River Hull, Wawne. Spring 
Ditch, very abundant. Harrogate. Beverley Parks. 
Haltenprice. 
N. Brebissonii, Sm. — Local but plentiful in a small brackish 
ditch near the River Hull, above Stoneferry. 
N. socialis, Greg. — Not uncommon in a Dredging, Flambro' 
Head. 
N. macilenta. Greg. — Rare in a Dredging, Flambro^ Head. 
N. Sigma, Sm. — Very frequent in salt water pools and 
ditches. Dairycoats, under Railway arch. River Hull, 
frequent. Victoria Dock Piers. Grimsby. Timber 
Ponds, Victoria Dock. 
N. spectabilis, Sm. — Rare in a brackish ditch near Stone- 
ferry. 
N. linearis, Sm. — Not uncommon. Haltenprice. Cottingham. 
Beverley Parks. 
N. tenuis, Sm.- — Very common. Haltenprice. Beverley 
Parks. Spring Ditch. Nettleton. Cottingham, very 
frequent. 
N. spathulata, Sm. — Rare. On Breakwater Hessle, Mr. 
Robt. Harrison. Sands, Hornsea. North Humber Bank, 
Dr. Munroe. 
V. angularis, Sm. — Not unfrequent in salt water. Timber 
Pond, Victoria Dock. Piers, Victoria Dock. Ascidians. 
N. lanceolata, Sm. — Occasionally from Ascidians. 
N. Amphioocys, Sm. — Not unfrequent, but always much mixed. 
Soil, Benningholme Carrs. Nettleton. Harrogate. 
Cottingham. Wawne. Killinghall. Market Weighton 
Canal. 
N. vivax, Sm. — Copious in a brackish ditch near River Hull, 
above Stoneferry. 
N. parvula ? Sm. — Not uncommon in brackish or fresh water. 
Pure in a Pool at Withernsea. Victoria Dock Timber 
Pond. Cottingham. 
N. minutissima, Sm. — In a trough for poultry. 
