Hayward, P.J. & Ryland, J.S. (eds), 1990
The Marine Fauna of the British Isles and north-west Europe
The bible for identifying marine fauna, including very small species. A collection of chapters on all the diverse groups of marine animals found in the British Isles and north-west Europe. This is not a field guide, but is intended for use in the lab on living or dead specimens.
Unfortunately now very expensive (c. £200 per volume: Jan 2012)
There is a shorter single-volume version (the "Handbook") for those primarily interested in what they might find on or near the UK shores. Although mostly cut down from the present work, the Handbook also contains a few species not in the present work.
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||Most of the British and north-west European marine species known at the time.
||Numerous plates of line drawings in the text.
||Under a Stereo Microscope (also useful to examine under a Compound Microscope).