Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 391
Portion of valve of Isthmia nervosa, highly magnified, as usually seen,of Diatoms presenting this areolation, when examined with asufficient magnifying power, show the headed aspect character-istically displayed in Pleurosigma angulatum (Fig 166); and this is Fig. 164.
Microscopy · Biology
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