248 WEST: ADDITIONS TO FRESHWATER ALG. 
OrRDER—PEDIASTREZE 
Pediastrum angulosum Ehrmb. Ribblehead; Malham Tarn. 
Pediastrum boryanum (Turp.) Menegh. Doncaster. 
Pediastrum tetras (Ehrnb.) Ralfs. Ribblehead. 
ORDER—SORASTRE&. 
Celastrum microporum Nag. Malham Tarn. 
Ciass—PROTOCOCCOIDE. 
ORDER—EREMOBIE: 
Hydrianum heteromorphum Reinsch. Malham Tarn ; 
Greetland near Halifax. 
OrDER—PROTOCOCCACE 
Chlorococcum gigas (Kiitz.) Grun. Malham Tarn. 
*Tetraspora lubrica (Roth.) Ag. Greetland near Halifax. 
Scenedesmus acutus Meyen. Malham Tarn. 
Var. Obliquus Rabh. Moughton Fell. 
Scenedesmus quadricauda Bréb. Ribblehead; Malham 
arn; Doncaster. 
Crass—CYANOPHYCE. 
Sus-CLass—NOSTOCHINEE. 
OrRDER—NOSTOCACEA: 
*Nostoc macrosporum Menegh. Heseltine Gill. 
Nostoc muscorum Ag. Heseltine Gill. 
ORDER—OSCILLARIACE. 
Oscillaria limosa Ag. Moughton Fell; Peel Park, Bradford. 
*Oscillaria antliaria Jurg. Baildon. 
*Symploca ralfsiana Kiitz. Diam. trichom. 3°5—5p. Frizing- 
hall. 
Sus-CLass—CH ROOCOCCACE 
OrDER—CH ROOCOCCACE. 
Chroococcus turgidus Nag. Whernside. 
Merismopedia glauca Nig. Mirfield; Greetland near Halifax. 
Ciass—DIATOMACE&. 
OrpDER—DIATOME#. 
Cyclotella kutzingiana Thw. Moughton Fell; Horton near 
Bradford 
*Cyclotella meneghiniana Kiitz. Baildon. 
OT 
Naturalist, 
