References
- Wallace , Alfred R. 1876 . The Geographical Distribution of Animals London
- Sollas , W. J. 1884 . On the Origin of Freshwater Faunas: a Study in Evolution . Sci. Trans. Royal Dublin Society , iii (ser. ii.) part 5.Nov.
- Forbes , E. and Hanley , S. A History of British Mollusca and their Shells
- Hincks , Thomas . A History of British Hydroid Zoophytes
- Hincks , Thomas . A History of British Marine Polyzoa
- Gosse . A History of British Sea-Anemones and Corals