In conjunction with David Robertson and George Stewardson Brady (1832-1921) he wrote the Monograph of the Post Tertiary Entomostraca of Scotland, etc. for the Palaeontographical Society (1874); and he edited Henry Carvill Lewis's Papers and Notes on the Glacial Geology of Great Britain and Ireland, issued posthumously (1894).
Having devoted his especial attention to fossil microzoa, he now became the highest authority in Britain on the Foraminifera and Entomostraca.