Zeit^eJu-iff/.miss.Zoolof/ie Bd. LXVE. 



Ubersiclit der FurclTung A^on Dreissensia pohniiorpha 



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Tarlag T.'Wnhplm Engelmaim iiiLeipzig. 



LUTi.Anst.JuHuF. Klinl^bir dt, Leipzig, 



