Annandale, N. & Stewart, F. H. Illustrations of the zoology of the Royal Indian Marine Survey Ship Investigator under the command of commander W.G. Beauchamp, R.I.M. Mollusca. Plates 19-20 (Superintendent Government Printing, 1908). at <http://archive.org/details/Illustrationszo00>

Annandale, N. & Stewart, F. H. Illustrations of the zoology of the Royal Indian Marine Survey Ship Investigator under the command of commander W.G. Beauchamp, R.I.M. Mollusca. Plates 9-13 (Superintendent Government Printing, 1901). at <http://archive.org/details/Illustrationszo00>