Norman, on Dtatomacece, 
67 
N. vitrea, Nor. M. S. — Yery local. In a small brackish ditch 
near Uiver Hull, above Stoneferry. 
N. dubia, Sm. — Very common in brackish or fresh water. 
Stallingbro\ Cottingham, very pure. Humber Banks. 
Tetney. Ditch near River Hull, above Stoneferry, abun- 
dant. Wawne. Haltenprice. Dairycoats. Pure in a ditch 
running from Anlaby to Hessle Road. 
N. dubia Var. j3 Sm. — Not uncommon in fresh or brackish 
water. Skirlaugh, nearly pure. Clay Pit, Nettleton. 
Brackish ditch near River Hull. Pond in Stepney 
Lane. 
N. bilobatttj Sm. — Not unfrequent in brackish water. Pure 
under Railway arch, Dairycoats. Stallingbro\ Small 
ditch near the River Hull. Outlet, Hornsea Meer. 
A^. cursoria=Bacillaria cursorittj Donk. — Rare. In a sand- 
gathering, Hornsea. 
A^. plana, Sm. — Not frequent. Brackish ditch near River 
HuU. 
N, virgata, Roper. — Rare. Sands, Hornsea. Dredgings off 
Flambro' Head. 
N. insigniSj Greg. — Rare. Dredgings off Flambro^ Head. 
iV. Closterium, Sm. — Not unfrequent. Salt and brackish 
water. Humber Banks. Marfleet. Grimsby. Asci- 
dians. 
N. reversa, Sm. — Rare. Ascidians. Ditch near Stoneferry. 
N. acicularis, Sm. — Not frequent. Under Railway arch at 
Dairycoats. Cottingham, near Mr. Wilson^s Grounds. 
N. Tcenia, Sm. — Not uncommon. Humber Bank. Pure 
near Marfleet Clough. 
N, palea, Sm. — Not common. Cottingham. Pure near the 
Waterworks, Stoneferry. 
N. curvula, Sm. — Rare. In fresh and brackish water. 
Beverley Parks. Ditch running from Stoneferry to 
Sutton, Mr. Robt. Harrison. 
Amphiprora, Ehrenberg. 
A. alata, Kiitz. — Yery frequent in brackish water. Humber 
Banks, often pretty pure. Marsh Chapel. Breakwater, 
Hessle. Ditch near River Hull, above Stoneferry. 
Yictoria Dock Timber Pond. 
A. paludosa, Sm. — Not unfrequent in brackish water. Ditch 
running from Stoneferry to Sutton. Ditch near River 
Hull. Humber Banks. Ditch running from Anlaby to 
Hessle Road. 
A. " didyma, Sm. — Rare. Humber Banks," Dr. Munroe. 
