Volume I ( Protozoa through Ctenophora ) of " The Invertebrates ", published in February 1940, was acknowledged as " comprehensive " and " authoritative, " with " illustrations designed for clarity and simplicity . " Volume 2 ( Platyhelminthes and Rhynchocoela ) and Volume 3 ( Acanthocephala, Aschelminthes, and Entoprocta ), both published in 1951, were followed by Volume 4 ( Echinodermata ) in 1955, Volume 5 ( Smaller Coelomate Groups ) in 1959, and Volume 6 ( Mollusca I ) in 1967.
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