Norman, on Biatomacece. 
161 
S. Ulna, Ehr. — As abundant as the above in fresh water. 
Spring at Haltenprice. Wawne. River Derwent, at 
Malton. Reservoir Waterworks. Ripley. Harrogate. 
Haltenprice. Hornsea Deposit. Beverley. 
S. capitata, Ehr. — Frequent in fresh water. Copious in the 
Spring Ditch. Risby Pond. Reservoir Waterworks. 
Hornsea Peat, &c. 
S. tabulata, KUtz. — Frequent in brackish water. Humber 
Banks. Pools at Marfleet. 
S. affinis, Kiitz. — Flambro^ Head, on Alga, abundant. 
S. hamata, Sm. — Rare. Outlet to Lake Ripley Castle. 
B, Arcus, Kiitz. — Rare in brackish water. On Cladophora 
salt-water pool, Humber Bank, near Marfleet, copious. 
Abundant in a ditch, Stoneferry. 
S. fasciculata, Kiitz. — Rare. Outlet to Lake Ripley. 
S. superba,Ysjxtz. — Not frequent. Salt-water pools. Grimsby. 
Attached to Cladophora, Cleethorps. From Coralline, 
Whitby. 
S. Gaillonii, Ehr. — Rare. In a Dredging, Flambro' Head. 
S.fulgens, Sm. — Not unfrequent in brackish water. Humber 
Banks. Cleethorps. Near Marfleet Clough. Abundant 
near Marsh Chapel. 
S. tenera, Sm. — Rare. In a pond at Skirlaugh. 
CoccoNEMA, Ehrenberg. 
C. lanceolatum, Ehr. — Yery frequent in fresh water. Spring 
Ditch. River Hull, Wawne. Nettleton. Risby Pond. 
Newbald. Driffield. Hornsea Deposit. Pure in a 
stream, " Birk Craggs," Harrogate. 
C. cymbiforme, Ehr. — Not unfrequent in fresh water. Spring 
Ditch. Newsham Lake. Wall under a leaky tap. 
C. Cistula, Ehr. — Frequent in fresh water. Spring Ditch. 
Beverley. Wawne. Pond, Skirlaugh. Hornsea Deposit. 
C. parvum, Sm. — Rare. On a wall under a leaky water-tap. 
Ditch Anlaby Road, Dr. Munroe. 
C. cornutum, Greg. — Rare. In the Reservoir Waterworks. 
DoRYPHORA, Kiitzing. 
L. Amphiceros, Kiitz. Abundant in Ascidians. River Hull. 
Sparingly in the Reservoir Waterworks, to which salt 
water occasionally has access. Ditch near the River Hull, 
beyond Stoneferry. 
D. Boeckii, Sm. — Very rare. In a gathering from Corallina 
officinalis f Whitby. 
