Gregory, W. (1855). On a remarkable group of Diatomaceous forms, with remarks on Shape or Outline as a specific character in the Diatomaceae. Transactions of the Microscopical Society, New Series, London, 3: 10-15, pl. II (p. 31-32, explanation).
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Gregory, W.
1855
On a remarkable group of Diatomaceous forms, with remarks on Shape or Outline as a specific character in the Diatomaceae.
Transactions of the Microscopical Society, New Series, London