He authored Conchologia indica with William Theobald which was a treatise on the shells of British India .
Sylvanus Charles Thorp Hanley ( 1819 -- 1899 ) was a British conchologist and malacologist who published the first book on shells using the then new technique of photographs .
Sylvanus Charles Thorp Hanley authored Conchologia indica with William Theobald which was a treatise on the shells of British India .
Sylvanus Charles Thorp Hanley ( 1819 -- 1899 ) was a British conchologist and malacologist who published the first book on shells using the then new technique of photographs .