SF Encyclopedia Picture Gallery
A E van Vogt. The Silkie (New York: Ace Books, 1969) [fixup: all stories first published in If": "The Silkie" in July 1964, "Silkies in Space" in May 1966 and "Enemy of the Silkie" in October 1967: pb/Jack Gaughan]
Image courtesy of Clute Science Fiction Library at Telluride