VOLUME IV.
Reading edition
Crustacea, by Geoffrey W. Smith, M.A., and the late W. F. R. Weldon, M.A.; Trilobites, by Henry Woods, M.A.; Introduction to Arachnida, and King-Crabs, by Sir A. E. Shipley, G.B.E., M.A., F.R.S.; Eurypterida, by Henry Woods, M.A.; Scorpions, Spiders, Mites, Ticks, etc., by Cecil Warburton, M.A.; Tardigrada (Water-Bears), by Sir A. E. Shipley, G.B.E., M.A., F.R.S.; Pentastomida, by Sir A. E. Shipley, G.B.E., M.A., F.R.S.; Pycnogonida, by D'Arcy W. Thompson, C.B., M.A.