WEST: ADDITIONS TO FRESHWATER ALG#. 251 
_ Nitzschia linearis (Ag.) Sm. Holden Gill near Keighley ; 
Baildon ; Doncaster ; Woolley. 
Nitzschia tenuis Sm. Moughton Fell; Doncaster. 
Nitzschia minutissima Sm. Baildon; Malham Tarn. 
*Nitzschia communis Rabh. Allerton. 
*Nitzschia palea (Kiitz.) Sm. Allerton. 
Nitzschia acicularis Sm. Mirfield; Adel Bog. 
Navicula cuspidata Kiitz. Moughton Fell. 
Navicula rhomboides Ehbrnb. Moughton Fell; Peel Park, 
Bradford ; Morley; Greetland near Halifax. 
Navicula inflata Kiitz. Allerton. 
Navicula elliptica Kiitz. [Syn. 4. ovalis Sm.]. Baildon. 
*Navicula sphzrophora Kiitz. Doncaster. 
*Navicula dirhynchus Ehrnb. Adel Bog; Malham Tarn; 
Morley. 
Navicula rhynchocephala Kiitz. Greetland near Halifax. 
Navicula affinis Ehrnb. Moughton Fell; Horton near 
Bradford ; Peel Park, Bradford ; Rombalds’ Moor. 
Navicula amphirhynchus Ebrnb. Adel Bog; Cullingworth. 
*Navicula exilis (Kiitz.) Grun. Cullingworth ; Doncaster ; 
Baildon ; Woolley. 
Navicula angustata Sm. Moughton Fell; Bingley; Don- 
caster ; Greetland near Halifax 
Navicula cryptocephala Kiitz. Moughton Fell. 
Navicula dicephala Ehrnb. Allerton ; Whernside ; Halifax. 
*Navicula binodis Ehrnb. Baildon ; Rombalds’ Moor. 
Pinnularia nobilis Ehrnb. Eldwick; Moughton Fell. 
Pinnularia major Rabh. Malham Tarn. 
Pinnularia viridis (Ehmb.) Rabh. Manningham Park; 
Malham Tarn; Greetland near Halifax. 
Pinnularia oblonga (Kiitz.) Rabh. Baildon ; Peel Park. 
*Pinnularia peregrina Ehrnb. Allerton; Goole. 
Pinnularia radiosa (Kiitz.) Rabh. Moughton Fell ; Baildon ; 
Mirfield ; Morley; Elslack ; Malham Tarn ; Greetland near 
Halifax. 
*Pinnularia dactylus Ehrnb. Wigton Moor. 
*Pinnularia acuminata Sm. Adel Bog 
[ 
formis Sm.}. Cullingworth ; Manningham Park ; Adel Bo 
*Pleurosigma attenuatum (Kiitz.) Sm. Manningham Park. 
August 18qr. 
