Some little while ago the Government Geologist of Tasmania, Mr. P. B. Nye, M.Sc., B.M.E., forwarded to me at the National Museum, Melbourne, for determination, a specimen of slaty shale with fossil impressions. The rock must have originally been of the nature of a fine, slimy, or plastic mud, for the impressions are very well preserved.Subclass Polychaeta .Fam. TASMANADIIDAE, nov.Genus Tasmanadia, nov.Horizon.-Probably Cambrian.Locality.-Kirkup's Quarry, Arthur River, Tasmania.Holotype in Geological Survey Museum, Hobart.