O, would there were few enough in this particular group of animal parasitic helminths to be contained in a single volume. Alas, three volumes will be required. The key helps specialist and non-specialists identify sexual adults of trematodes, which are normally found in vertebrate hosts. The first volume covers the Aspidogastrae and digenean groups belonging to the order Strigeida. Among them are the blood flukes, brachylaemids, bucephalids, clinostomids, displostomids, fellodistomids, gymnophallids, hemiuroids, and strigeids. The Didymozoidae chapter was not completed by press deadline, and will be included in a subsequent volume. Taxonomic names are indexed. Distributed in the US by Oxford University Press. Annotation c. Book News, Inc., Portland, OR (booknews.com)