WEST : NOTES ON THE FRESH-WATER ALG. 215 
Staurastrum muticum Bréb. Riccall Common. 
Staurastrum orbiculare (Ehrnb.) Ralfs. Riccall Common. 
Staurastrum orbiculare var. depressum Roy. et Biss. Riccall 
Common 
Ractacthin alternans Bréb. Riccall Common. 
Staurastrum dilatatum Ehrnb. Riccall Common. 
Staurastrum brachiatum Ralfs. Riccall Common. 
Staurastrum tricorne (Bréb.) Menegh. Riccall Common. 
Staurastrum cyrtocerum Bréb. Riccall Common. 
Staurastrum polymorphum Bréb. Riccall Common. 
Staurastrum gracile Ralfs. Riccall Common. 
Staurastrum paradoxum Meyen. Riccall Common. 
Staurastrum controversum Bréb. Riccall Common. 
Staurastrum vestitum Ralfs. Riccall Common. 
Staurastrum oxyacanthum Arch. Riccall Common. 
Staurastrum tetracerum (Kiitz.) Ralfs. Riccall Common. 
Crass MULTINUCLEATA. 
OrpverR SIPHONE. 
Vaucheria sericea Lyngb. Beverley. 
Vaucheria sessilis (Vauch.) DC. Newsholme; near Sutton; 
near Meaux Abbey. 
Crass CCENOBIE. 
OrperR PANDORINE#. 
Pandorina morum Miill. Hornsea Mere. 
Chlamydococcus pluvialis A.Br. Beverley. 
ORDER PEDIASTRE#. 
Pediastrum Boryanum (Turp.) Menegh. Hornsea Mere. 
Pediastrum gracile A.Br. Riccall Common 
Pediastrum tetras (Ehrnb.) Ralfs. Dispositio es ‘ 
Riccall Common. 
OrpDER SORASTRE#. 
eres rectangularis (Nag.) A.Br. Hornsea Mere. 
neue sphzricum Nag. Riccall Common. 
. m microporum Nag. Riccall Common. 
