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Poseidonis is a collection of fantasy short stories by Clark Ashton Smith, edited by Lin Carter. It was first published in paperback by Ballantine Books as the fifty-ninth volume of its Ballantine Adult Fantasy series in July 1973. It was the fourth collection of Smith's works assembled by Carter for the series. The stories were originally published in various fantasy magazines in the 1930s and 1940s, notably Weird Tales.

Cover of Poseidonis
EditorLin Carter
AuthorClark Ashton Smith
Cover artistGervasio Gallardo
CountryUnited States
SeriesBallantine Adult Fantasy series
PublisherBallantine Books
Publication date
Media typePrint (paperback)
Preceded byXiccarph 

The book collects several prose poems, poems and tales, including stories from the author's Poseidonis cycle, set on a remnant of the lost continent of Atlantis.


  • "The Magic of Atlantis: An Introduction", by Lin Carter
  • Poseidonis
  • "Editor's Note"
  • "The Muse of Atlantis" (prose poem)
  • "The Last Incantation"
  • "The Death of Malygris"
  • "Tolometh" (poem)
  • "The Double Shadow"
  • "A Voyage to Sfanomoë"
  • "A Vintage from Atlantis"
  • "Atlantis: a poem" (poem)
  • Lemuria
  • "Editor's Note"
  • "In Lemuria" (poem)
  • "An Offering to the Moon"
  • "The Uncharted Isle"
  • "Lemurienne" (poem)
  • Ptolemides
  • "Editor's Note"
  • "The Epiphany of Death"
  • Other Realms
  • "Editor's Note"
  • "In Cocaigne" (prose poem)
  • "Symposium of the Gorgon"
  • "The Venus of Azombeii"
  • "The Isle of Saturn" (poem)
  • "The Root of Ampoi"
  • "The Invisible City"
  • "Amithaine" (poem)
  • "The Willow Landscape"
  • "The Shadows" (prose poem)