Norman^ on Diatouwceaf. 
163 
Bacillaria_, Gmelin. 
B. paradoxa, Gmel. — Very abundant in brackish water. 
Ditch near River Hull, above Stoneferry, abundant. 
Victoria Dock Timber Pond. Market Weighton Canal. 
Humber Banks. Copious in a ditch between Stoneferry 
and Sutton. 
HiMANTiDiUM_, Ehrenberg. 
H, pectinale, Kiitz. — Not unfrequent in clear fresh water. 
Cottingham. Spring at Saltersgate, pure. 
H. undulatum, Sm. — Not unfrequent with the above in the 
Spring at Saltersgate. 
H. Arcus, Sm. — Rare. Wawne Ferry. 
H. gracile, Ehr. — Rare. In the River Hull. 
H. majus, Sm. — Rare. Stream near the Springs, Cotting- 
ham. 
Odontidium, Kiitzing. 
O. mutabile, Sm. — Very abundant in fresh clear water. Risby 
Pond. Wawne. Market Weighton Canal. Abundant 
near Cottingham. Spring Ditch, copious. 
O. Tabellaria, Sm. — Not unfrequent in fresh water. Horn- 
sea Meer. Risby Pond. River Hull at Wawne. Horn- 
sea Peat Deposit. 
O, Harrisonii, Sm. — Abundant in fresh water, though gene- 
rally much mixed. Haltenprice. Spring Head. Horn- 
sea Deposit. Spring Ditch. Abundant near Cottingham, 
but always much mixed. Quite pure and copious, 
attached to sand in a bubbling spring near Hull. 
O. parasiticum, Sm. — Rare. Market Weighton Canal. 
Beverley Parks, near Woodmancy. 
Denticula, Kiitzing. 
D. tenuis, Kiitz. — Rare. In the River Hull, Wawne Ferry. 
Anlaby Road, Dr. Munroe. 
D. inflata, Sm. — Not unfrequent in a spring near Newbald. 
D. sinuata, Sm. — Rare. Cottingham, in a stream near the 
springs. Ditch in Beverley Parks, near Woodmancy. 
Fragillarta, Lyngbye. 
F. capucina, Desm. — Frequent in fresh- water ditches. Ingle- 
mire Lane. Wall under a leaky tap. Cottingham, &c. 
F. virescens, Ralfs. — Frequent in fresh-water ditches. Cot- 
tingham. Wawne. Inglemire Lane. 
VOL. VIII. r 
