The invertebrates. Vol.5, Smaller Coelomate groups: Chaetognatha,Hemichordata,Pogonophora,Phoronida,Ectoprocta,Brachipoda,Sipunculida,the Coelomate Bilateria by Libbie Henrietta Hyman. Published by McGraw-Hill in 1959. Publication and catalogue information, links to buy online and reader comments.