250 WEST: ADDITIONS TO FRESHWATER ALG. 
Cocconeis placentula Ehrnb. Moughton Fell; Baildon; 
Malham Tarn. 
Forma perpusilla Rabh. Baildon. 
Cocconeis thwaitesii Sm. Bingley. 
Achnanthidium microcephalum Kiitz. Baildon. 
Kiem wee lanceolatum Bréb. Baildon; Cullingworth ; 
Whernside ; Woolley ; Elslack. 
*Achnanthidium coarctatum Bréb. Bingley. 
Achnanthes exilis Kiitz. Malham Tarn; Baildon; Mirfield ; 
Cullingworth. 
*Denticula obtusa Sm. Bingley; Holden Gill near Keighley. 
*Denticula sinuata Sm. Baildon. 
Odontidium hiemale (Lyngb.) Kiitz. Greetland near Halifax. 
Odontidium mesodon Kiitz. Whernside; Holden Gill near 
Keighley ; Calfbeck, Howgill Fells. 
Cdontidium mutabile Sm.  Baildon;~+ Holden Gill near 
Keighley. 
Fragilaria capucina Sm. Holden Gill near Keighley ; Man- 
ningham Park. 
Diatoma elongatum Ag. Holden Gill near Keighley. 
Synedra lunaris Ehrnb. Mirfield; Elslack. 
Synedra longissima Sm. Rombalds’ Moor. 
*Synedra pulchella Kiitz. Baildon; Bingley ; Whernside. 
*Synedra acicularis Sm. Mirfield. _ 
*Synedra vaucheriz Kiitz. Mirfield ; Allerton. 
Synedra ulna Ehrnb. Holden Gill near Keighley ; Mirfield ; 
Morley ; Peel Park, Bradford. 
Synedra splendens Kiitz. Peel Park, Bradford ; Manningham 
Park ; Elslack ; Wooley. 
*Sunedia acus Kiitz. Greetland near Halifax. 
Asterionella formosa Hass. Penyghent; Holden Gill near 
Keighley ; Greetland near Halifax. 
Nitzschia amphioxys (Ehmb.) Sm. Shipley; Peel Park, 
Bradford ; Baildon 
Nitzschia behiricee (Kiitz.) Pritch. (Syn. WV. dubia Sm. |. 
FoRMA minor Rabh. Baildon. 
*Nitzschia parvula Sm. Doncaster. 
itzschia sigmoidea (Nitzsch) Sm. Doncaster; Whernside- 
oe curvula (Ehrnb.) Sm. Allerton ; Cullingworth ; Adel 
og. 
TT 
Naturalist, 
