RELATIVE SIZES 



OF Sor\/iE: c o rvi t\/n o M ivi icro- of^ga n isi 



ASTETRIONELLA 



N/l ELOS/F^-A 



CYCLOTELLA 



PR-OT-OCOCCUS SCErsiCDESrs/lUS SXAUFfASTRUN/a 



A N AB/^ETN A 



Dl NJOBR-VOtNi 



SYIMUR A 



□ o 



STANDARD U M 1 T" 



I AREA = '^OO SquAFfEl r\/liCF(ONs) 



