1st Edition 1952-74. A three volume complete collection of this work on arachnology by Locket and Millidge for the Ray Society. Written by George Hazelwood Locket and Alfred Frank Millidge, British arachnologists who shared the H. H. Bloomer award in 1974. This work was printed by the Ray Society, a publication society who print works regarding British flora and fauna. Named for naturalist John Ray, it is based at the Natural History Museum, London. , Very uncommon. Illustrated. Bound in the original cloth. Books are very good++ and bright. Contents are good. The wrappers are very good+ and quite bright. Edge lightly rubbed. Two wrappers slightly age toned.