The Earthworms Synopsis starts with a review of the biology of earthworms (including physiology, reproduction, movement, feeding relationships and parasites) and practical methods (collection techniques, preservation of specimens and data recording).

Accurate identification keys, focusing on distinctly recognisable external features, will aid identification of the 44 species featured.

Synopses of the British Fauna is a series of identification guides. Each volume in the series provides a detailed account of a group of animals. They bridge the gap between standard field guides and the more specialised monograph or treatise. Since 1993 the the Field Studies Council has published these guides on behalf of the Linnean Society.

These volumes are suitable for the lab or field. Technical terminology is kept to a minimum and a glossary of terms provided. However the complexity of the subject matter makes the books more suitable for the more experienced practitioner.