Norman, on Diatomaceap. 
167 
E. ccespitosum, Kiitz. — Frequent in fresh water. River Hull, 
Wawne. Reservoir Waterworks. Stream "Birk Cragg/^ 
Harrogate. Newland, Toft Lane, Dr. Munroe. 
CoLLETONEMA, Brebissou. 
C. eximium, Thw. — Not unfrequent, though always much 
mixed. River Hull, near Stoneferry, frequent. Wawne. 
Outlet to Hornsea Meer. 
C vulgare, Thw. — Rare. Spring at Cottinghara, 
C. neglectum, Thw. — Rare in fresh water. Wall under a 
leaky tap. River Hull, Wawne. Reservoir Water- 
works. 
ScHizoNEMA, Agardh. 
crucigerum, Sm, — Very frequent in salt and brackish 
water. Copious and nearly pure in the Victoria Dock 
Timber Pond. Outlet Hornsea Meer. Tetney. Humber 
Banks. Grimsby Timber Pond. 
S. Smithii, Ag. — Abundant, growing on the submerged Peat 
Beds at Hornsea. 
S. divergens, Sm. — Salt-water ditch, Marsh Chapel. 
S. Dillwynii, Ag. — Not unfrequent in brackish water. Hum- 
ber Banks. Copious, Victoria Dock Timber Pond. 
S. laciniatum, Harv. — Abundant on Rocks, Plambro' Head. 
S. helmintosum, Chauv. — Timber Pond, Victoria, Dock, Mr. 
Robt. Harrison. 
HoMCEOCLADiA, Agardh. 
H. sigmoidea, Sm. — Abundant on the Piers of the Victoria 
Dock. New Holland Jetty. Breakwater near Hessle. 
Gloionema, Ehrenberg. 
G. sigmoidea? Ehr. — Abundant in the Magnesian Well, 
Harrogate. Also abundant on some mooring posts near 
Dairycoats, 
ASTERIONELLA, HaSScU. 
A. formosa, Hass. — Not unfrequent in the wooden Outlet to 
the Pond at Ripley Castle. 
A. Ralfsii, Sm. — Very frequent in Ascidians. 
A. Bleakeleyii^ Sm.? — Rare in an Ascidian gathering. 
Cresswellia, Arnott. 
A. Turris, Arnott. — Frequent in Ascidians. 
VOL. Vlll. 
s 
