Horridge, George AdrianBurrows, M.2019-08-252019-08-250022-0949http://hdl.handle.net/1885/165177At the time of publication the author was affiliated with the Gatty Marine Laboratory and Department of Natural History, University of St Andrews, Fife, Scotland.10 pagesapplication/pdfen-AU© 1968 The Company of Biologists Ltd.1968