Volume I.

PROTOZOA, Marcus Hartog, M.A., Trinity College (Professor of Natural History in the Queen's College, Cork); SPONGES, W. J. Sollas, Sc.D., F.R.S., St. John's College (Professor of Geology in the University of Oxford); JELLY-FISH, SEA-ANEMONES, ETC., S. J. Hickson, M.A., Downing College (Beyer Professor of Zoology in the Owens College, Manchester); STAR-FISH, SEA-URCHINS, ETC., E. W. Macbride, M.A., St. John's College (Professor of Zoology, M‘Gill University, Montreal).