164 
Norman, on Diatomacece. 
F. striatula, Lyng. — Abundant on Cladophora on the Rocks, 
Flambro^ Head. Filey Bridge. 
EucAMPiA, Ehrenberg. 
E. Zodiacus, Ehr. — Not nnfrequent in Ascidians. 
AcHNANTHEs, Bory. 
A. longipes, Ag. — Very abundant in salt water. Victoria 
Dock Timber Pond_, very copious and pure. Marsh 
Chapel. Humber Banks. Grimsby Timber Ponds. 
Very abundant on ships^ bottoms after a long voyage. 
A. brevipes, Ag. — Very abundant in salt water. Victoria 
Dock Timber Pond. Cleethorps. Humber Banks. 
Tetney. Ditches near Stoneferry. Abundant on ships' 
bottoms. 
A. suhsessilis, Kiitz. — Bare. Pure and copious in pools on 
the Humber Banks, near Marfleet, attached to Clado- 
phora. 
A. exilis, Kiitz. — Not unfrequent in fresh water. Springs, 
Newbald. Springs, Cottingham. Under a leaky tap. 
Wawne. Reservoir Waterworks. 
AcHNANTHiDiUM, Kiitzing. 
A. lanceolatum, Breb. — Eresh water, not common. Ditch, 
Cottingham, near Mr. Harrison^s Grounds. River Hull, 
at Wawne. 
A. microcephalum, Kiitz. — Rare in fresh water. On a wall 
under a leaky tap. 
A. lineare — Sm. — Not unfrequent in fresh water. Cottingham 
Beck, attached to Cladophora. Benningholme. Pond at 
Skirlaugh. 
Rhabdonema, Kiitzing. 
R. arcuatum, Kiitz. — Frequent on Cladophora at Filey Bridge. 
Whitby. Flambro^ Head. Ascidians. Dairycoats, Mr. 
Robt. Harrison. 
R. Adriaticum, Kiitz. — Rare. On Coralline, Whitby. 
R. minutum, Kiitz. — Rare. On Coralline j Whitby. Filey 
Bridge. 
Hyalosira, Kiitzing. 
H. delicatulaj Kiitz. — Abundant and nearly pure on a ship's 
bottom from San Felipe. 
