painting by Frederick William Frohawk (1861–1946), National Museum Wales, National Museum Cardiff

London: R.H. Porter, 1890-1899.

London,Printed by order of the Trustees of the British museum,1919. | Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

London: Caxton Pub. Co., [1907-08]

Hull ;Brumby & Clarke, [1907?-1908?].

London, Brumby & Clarke[1896-98]

painting by Frederick William Frohawk (1861–1946), National Museum Wales, National Museum Cardiff

painting by Frederick William Frohawk (1861–1946), National Museum Wales, National Museum Cardiff