If only Myrtle would pay attention to the Boy's Own Journal, Blackwood's Magazine, etc., she would know that these creatures were Threls, who come from a worldlet called Threlfall on the far side of the asteroid belt. This Threlfall is a cheerless, chilly spot, and the whole history and religion of the Threls has been concerened with their quest to knit a nice woolly coverlet for it.
