E. A.  Smith, ?Descriptions of a new species of Opisthostoma from Borneo?, Proceedings of the Malacological Society of London, vol. 6, p. 105, 1904.

E. A.  Smith, ?Description of a new species of Opisthostoma from North Borneo?, Proceedings of the Malacological Society of London, vol. 6, p. 105, 1905.