[Ready.
VOLUME IV.
Spiders, Mites, etc., C. Warburton, M.A., Christ's College (Zoologist to the Royal Agricultural Society); Scorpions, Trilobites, etc., M. Laurie, B.A., King's College, D.Sc. (Edinb.), (Professor of Zoology in St. Mungo's College, Glasgow); Pycnogonids, etc., D'Arcy W. Thompson, C.B., M.A., Trinity College (Professor of Zoology in University College, Dundee); Crustacea, W. F. R. Weldon, M.A., F.R.S., St. John's College (Jodrell Professor of Zoology in University College, London).
VOLUME V.
Peripatus, A. Sedgwick, M.A., F.R.S., Trinity College; Centipedes, etc., F. G. Sinclair, M.A., Trinity College; Insects, Part I., D. Sharp, M.A., F.R.S.
[Ready.
VOLUME VI.
Insects, Part II., D. Sharp, M.A., F.R.S.
[Ready.
VOLUME VII.