214 WEST : NOTES ON THE FRESH-WATER ALG. 
Cosmarium undulatum Corda. Riccall Common. 
Cosmarium tetraophthalmum (Kiitz.) Bréb. Riccall Common. 
Cosmarium tetraophthalmum var. Lundellii Wittr. Hornsea 
Mere. 
Cosmarium margaritiferum (Turp.) Menegh. Riccall Common; 
Hornsea Mere. 
Cosmarium Portianum Arch. Riccall Common. 
Cosmarium reniforme (Ralfs.) Arch. Riccall Common. 
Cosmarium punctulatum Bréb. Riccall Common. 
Cosmarium subpunctulatum Nord. Riccall Common. 
Cosmarium subpunctulatum Nord. forma cum apicibus minus 
late truncatis. Hornsea Mere. 
Cosmarium Botrytis (Bory) Menegh. NHornsea Mere; Riccall 
Common ; Newsholme ; Loftsome Bridge near Wressle. 
Cosmarium formosulum Hoff. Riccall Common. 
Cosmarium premorsum Bréb. Riccall Common. 
Cosmarium Broomei Thw. Riccall Common. 
Cosmarium confusum Cooke var. regularius Nord. Riccall 
Common. 
Cosmarium ornatum Ralfs. Riccall Common. 
Cosmarium moniliforme (Turp.) Ralfs. Riccall Common. 
Cosmarium moniliforme forma panduriformis Heimer. 
Riccall Common. Long. 17°7 »; lat. rop; lat. isthm. 774}. 
Xanthidium aculeatum Ehmb. Riccall Common. 
Xanthidium cristatum Bréb. Riccall Common. 
mene octocornis Ehrnb. Riccall Common. 
smus Ralfsii West. Riccall Common. 
Acthegieee convergens Ehmb. Riccall Common. 
Staurastrum dejectum Bréb. Riccall Common. 
Staurastrum connatum (Lund.) Roy. et Biss. Riccall Common. 
Staurastrum apiculatum Bréb. Riccall Common. 
Staurastrum Dickiei Ralfs. Riccall Common. 
Staurastrum brevispinum Bréb. Riccall Common. 
Staurastrum cuspidatum Bréb. Riccall Common. 
Staurastrum avicula Bréb.  Riccall Common. 
Staurastrum teliferum Ralfs. Riccall Common. 
: Staurastrum asperum Bréb. Riccall Common. 
