WEST: NOTES .ON THE FRESH-WATER ALG. 213 
Penium cucurbitinum Biss. Riccall Common. 
Penium minutum (Ralfs) Cleve. Riccall Common. 
Cylindrocystis Brebissonii Menegh. Riccall Common. 
Cylindrocystis crassa D.By. East of Selby. 
Tetmemorus levis (Kiitz.) Ralfs. East of Selby. 
Mesotenium micrococcum (Kiitz.) Kirchn. East of Selby. 
Euastrum ansatum Ehrmb. Riccall Common. 
Euastrum pectinatum Bréb. Riccall Common. 
Euastrum rostratum Ralfs. Riccall Common. 
Euastrum elegans (Bréb.) Kiitz. Riccall Common. 
Euastrum erosum Lund. var. notabile West. Riccall Common. 
Euastrum binale (Turp.) Ralfs. Riccall Common. 
Euastrum binale var. elobatum Lund. Riccall Common. 
Euastrum denticulatum (Kirchn.) Gay. Riccall Common. 
Cosmarium quadratum Ralfs. Riccall Common. 
Cosmarium Hammeri Reinsch. Riccall Common. 
Cosmarium granatum Bréb. Hornsea Mere ; Riccall Common. 
Cosmarium granatum var. subgranatum Nord. Hornsea Mere. 
Long. 26°5—27°5 #; lat. 19°8—21°3 »; lat. isthm. 6°6—8°3 p. 
Cosmarium pyramidatum Bréb. Riccall Common. 
Cosmarium pseudopyramidatum Lund. Riccall Common. 
Cosmarium galeritum Nord. Riccall Common. 
-Cosmarium Phaseolus Bréb. Riccall Common. 
Cosmarium bioculatum Bréb. Riccall Common. 
Cosmarium tinctum Ralfs. Riccall Common. 
Cosmarium succisum West. Riccall Common. 
_ Cosmarium impressulum Elfv. Hornsea Mere. 
Cosmarium venustum (Bréb.) Arch. Riccail Common ; Horn- 
sea Mere. _ | 
Cosmarium Meneghinii Bréb. Riccall Common ; Hornsea 
Mere ; Newsholme. a 
: Cosmarium Meneghinii Bréb. forma coctangularis Wille. 
-Riccall Common ; Hornsea Mer 
Cosmarium Meneghinii Bréb. var. . Wollei Lagerh. Riccall 
Common. 
-Cosmarium Regnesii Reinsch. Riccall Common, abundant. — 
< Long. 8.3—r12°1 mw; lat. 9°3—13°5 # ; lat. isthm. 4°4—5°8 p. 
_ Cosmarium —— Nord. Riccall Common:; ; Hornsea 
o Mere. 
July 7893, 
