R.  Tate and Woodward, S. Peckworth, Appendix to the Manual of Mollusca of S.P. Woodward, A.L.S. :. London :Virtue & Yorston, 1868, p. 106.

L.  Pfeiffer, Monographia heliceorum viventium, sistens descriptiones systematicas et criticas omnium hujus familiae generum et specierum hodie cognitarum, vol. 6. Lipsiae: , 1868, p. 598.

W. T.  Blanford, ?On the occurrence of Diplommatina Huttoni and Ennea bicolor in the West Indies?, The annals and magazine of natural history, including zoology, botany and geology, vol. 4, pp. 110-112, 1868.

C. M.  Troschel, ?Bericht über die Leistungen in der Naturgeschichte der Mollusken während des Jahres 1867?, Archiv für Naturgeschichte, vol. 34, p. 2, 1868.