Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 562
d there appears little reason to doubtthis. The coarse areolations are for the most part circular in outline,and the intervening silex is thick. Inside these areolations is an ex-tremely delicate perforated membrane, the outer row of whose perfora-tions are larger than the rest. From the very… … In Isthmia nervosa, a side and front view of which are seen infig. 408, a similar construction is discoverable. In this diatom thecoarse areola tions are very large and the silex correspondinglythick ; but the inner membrane is excessively thin and delicate. Theperforations are large and irregular…
Microscopy
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