A pictoral key organized by characteristics judged most easily observed by students. However, four relatively recent classification outlines are included to provide some information on the natural relationships of nematodes. Includes some further information related to nematode taxonomy, including a descriptive key without pictures; literature citations for each genus; a list of general references on taxonomy and morphology; and a glossary. First published in 1962. Annotation c. by Book News, Inc., Portland, Or.