Published in Bollettino Malacologico, in 1981, in volume 17, issue 1-2, pages 253-258

Published in Bollettino Malacologico, in 1981, in volume 17, issue 1-2, pages 259-264

Published in Bollettino Malacologico, in 1981, in volume 17, issue 1-2, pages 291-294

Published in Bollettino Malacologico, in 1981, in volume 17, issue 7-8, pages 199-200