Norman, on Diatomacece. 
63 
E, fulvus, Sm. — Very plentiful and fine in Ascidians. 
E. crassus, Sm. — Ascidian gatherings. Sands, Hornsea. 
Stoneferry. 
E, sculptus, Sm. — Eare. Ascidian gatherings. 
E. tesselatus, Roper. — Very abundant and fine in Ascidians, 
sometimes nearly pure. 
E. Ralfsii, Sm. — Rare. Ascidian gatherings. 
AcTiNOCYCLus, Elirenbcrg. 
A, undulatus, Kiitz. — Very frequent in Ascidian gatherings. 
Stoneferry, rare. Dredgings Flambro^ Head. Filter 
Waterworks, rare. 
Trtceratium, Ehrenberg. 
T. favus, Ehr. — Very rare in Ascidians. Single frustule. 
Walls of Victoria Dock. 
T. alternans, Bailey. — Frequent in Ascidian gatherings. 
T. striolatmn, Ehr. — Rare in Ascidians. 
T. armatum, Roper. — Very rare in Ascidians. 
T. undulatum, Brightwell. — Very frequent in Ascidians. 
Cyclotella, Kiitzing. 
C. Kutzingiana, Thwaites. — Very common in fresh and 
brackish water. Spring Ditch. Cottingham. Tetney. 
Stoneferry. Market Weighton Canal. Wawne. 
C. minutula, Kiitz. — Frequent in the Hornsea Deposit. 
C, operculata, Kiitz. — Frequent in clear Ditches. Spring- 
Ditch. Cottingham. Ripley. Pure in a Drinking 
Trough for Poultry. 
C. rotulttj Kiitz. — Rare. Market Weighton Canal. Hornsea 
Deposit. 
C. punctata, Sm. — Very copious and fine in a gathering made 
in the Market Weighton Canal, near the River Foulney, 
attached to Myriophyllum and Potamogeton. 
C. Dallasiana, Sm. — Rare. In a ditch running from Stone- 
ferry to Sutton. 
Campylodiscus, Ehrenberg. 
C. costatus. — Frequent. Spring Ditch. Plentiful in an Iron 
spring, Haltenprice. Springs, Cottingham. Springs, 
Newbald. Market Weighton Canal. Hornsea Deposit. 
VOL. VIII. k 
