different between cirripede vs cirripeds

English

cirripede (plural cirripedes)

Alternative spelling of cirriped
- 1859 Charles Darwin, On the Origin of Species, p. 267:
  But my work had hardly been published, when a skilful palaeontologist, M. Bosquet, sent me a drawing of a perfect specimen of an unmistakeable sessile cirripede, which he had himself extracted from the chalk of Belgium.

cirripeds

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