Melvill incorrectly gave the original combination as <i>Chrysallida casta</i> Adams, 1861, copying Tryon (1886), but Tryon illustrated <i>Monotigma casta</i> A. Adams, 1853.
Melvill, J. C. (1910). A revision of the species of the family Pyramidellidae occurring in the Persian Gulf, Gulf of Oman and North Arabian Sea, as exemplified mostly in the collections made by Mr. F.W. Townsend (1893-1900), with descriptions of new species. iProceedings of the Malacological Society of London. 9: 171-207, pls 4-6. available online athttp://www.biodiversitylibrary.org/page/30825003