1964-1991 Large 4to and 4to and 8vo. Stapled, last one in printed wrappers. First paper not present but that is just a short introduction to the series.Numerous pages and illustrations. Numerous topics like: Collecting non-marine Mollusca / Glossary terms / Preparation of radula / Dissecting Snails / Identification British Chitons / Care of a Collection / Collecting British Marine Molluscs / Key to British Slugs / British Littoral Mollusca / Handlenses and Microscopes / Introduction Scaphopoda / Introduction Cephalopoda / Keeping a Marine Aquarium, etc.
1970-1985 Small folio and 4to.Numerous pages and illustrations. Seven consecutive issues of this informative series. Two issues with the front page a bit spotted, otherwise good.