by Charles N. Colyer in collaboration with Cyril O. Hammond; with 25 plates in colour, 28 half-tone plates and numerous text figures and diagrams depicting 286 representative species from original enlarged microscope drawings by Cyril O. HammondF. Warne1968
by Charles N. Colyer in collaboration with Cyril O. Hammond; with 48 plates in colour, 55 half-tone plates and numerous text figures and diagrams depicting 286 representative species from original enlarged microscope drawings by Cyril O. HammondF. Warne1951