m n (6i) 



E. Bachmann R / S" ® - 3 i^ /«^ *'=;([ II ^ ^ *• 1)—+^ ^ iHfi, ^ff: 3 



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 x^mM'^ik^y f^&m^^^^>^-> ■^^,5L^mM=^Mr '^.muw-^M'^'^ 



mm^wmmm 



Dr. D. Levi-Morenos. Jc / K= ^ i' ''. ^E^'^.^Strfil ^'l^i^Sii; 



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Uffi^S ^ '^SB? ;?■ ^^ =■ 3 X', Cymbella, Synedra, Nitzschia, Navicula, Pinn- 

 ularia, Pleurosigma. MR^ ^ ®S^^ t+ ^± / if 5^*^ ^- '^ ^ S >^,%±i- 



'ttl>NlWfa>'fflllff'-^f «— )g/ * 7 ^r 7^f V'MS-f-^3 P^v^jv* 



