The Plume Coteries or Bookkeepers were a posthuman group of miniscule librarians who operated the largest library in the universe. (PROSE: White Canvas, Cobweb and Ivory) They also founded the colony planet RMS in the Amazolian system. (PROSE: A Farewell to Arms)
Dignitaries of the Coteries from the "distant reaches of dead space" came to Terra Primagenia to attend the unveiling of Cernunnos. (PROSE: Cobweb and Ivory)
Some Bookkeepers came to the Needle to witness the signing of the Christmas Needle Agreement, where they got into a heated talk with the Firmament. (PROSE: White Canvas)
Plume Coteries diplomatic craft were designed to be sleek and small for the Coteries' miniscule members. Huxley obtained one such ship from Yvleperal's allies. (PROSE: A Farewell to Arms)