The one inch spiral gill plumes of Christmas Tree Featherduster worms extend from a coral formation in 40 feet of water, Grand Cayman. The third, brown gill structure belongs to a second individual living uncharacteristically close to the yellow worm.
The genera vermium exemplified by various specimens of the animals contained in the orders of the Intestina et Mollusca Linnaei by BioDivLibrary, London. Printed for the author by James Dixwell, and sold by John Sewell, B. White and Son, and P.