I am greatly indebted to Mr. F. Spry for bringing to my knowledge some extremely interesting Upper Silurian fossils collected by him with great care and diligence from the tunnels excavated through the rocks underlying Melbourne during the progress of the new great drainage works for the city, carried out by the Metropolitan Board of Works. The age of the strata containing these fossils was originally determined by me for Selwyn's Geological Survey Maps of Victoria.