166 
Norman^ on Diatomacea. 
Melosira, Agardh. 
M. nummuloides, Klitz. — Abundant in salt and brackish water. 
Victoria Dock Timber Pond^ pure. Grimsby. Humber 
Banks. Ditch near Stoneferry. Dairycoats. 
M. Borrerii, Greg. — Abundant in salt and brackish water. 
Pure in pools^ Humber Banks. Copious in Victoria 
Dock Timber Pond. 
M. subflexilis, Kiitz. — Local in brackish water. Pure in a 
ditch running from Stoneferry to Sutton. 
M. varians, Ag, — Very abundant in almost everj'^ fresh-water 
stream. Pure and sporangial in a spring at Haltenprice. 
Spring Ditch. Cottingham. Wawne. Reservoir Water- 
works. Harrogate. Bipley. Hornsea Deposit. 
? M. sps with transverse lines. In Ascidians. 
? M. sps with longitudinal lines. In Ascidians. Common 
also in Peruvian Guano. 
Orthosira, Thwaites. 
O. arenaria, Sm. — Pure in a spring, Newbald. Hornsea 
Deposit. Tank in a tropical Fernery and Orchid 
House. 
O. marina, Sm. — Abundant in every Ascidian gathering. 
Sands at Hornsea. 
O. spinosa, Sm. — Sparingly in the Hornsea Peat Deposit. 
O. punctata, Sm. — Abundant in the Peat Deposit^ Hornsea. 
Sparingly in an Ascidian gathering, probably accidental. 
In a brackish ditch leading from Stoneferry to Sutton, 
sparingly. 
Mastogloia,, Thwaites. 
M. Danseii, Thw. — Rare. Outlet, Hornsea Meer. 
M. Smithii, Thw. — Rare in brackish water. Stallingbro^. 
Humber Bank. Ditch, near Stoneferry rare. 
M. lanceolata, Thw. — Rare. Timber Pond, Victoria Dock, 
Mr. Robt. Harrison. 
M. apiculata, Sm. — Rare with the above, Mr. Robt. Har- 
rison. 
Berkeleya, Greville. 
B. ^'fragilis, Grev. — Rare. Dairy coats,^^ Mr. Robt. Harrison. 
Encyonema, Kiitzing. 
E. prostratum, Ralfs. — Not unfrequent in fresh water. River 
Hull, Wawne. Reservoir Waterworks, copious. Harro- 
gate. Newland, Toft Lane, near Cemetery, Dr. Munroe. 
