Published in Malacologia, in 1981, in volume 20, pages 291-305
Published in Malacologia, in 1981, in volume 20, issue 2, pages 385-402
Published in Malacologia, in 1981, in volume 21, pages 291-336
Published in Malacologia, in 1981, in volume 21, issue 1-2, pages 61-93
Published in Malacologia, in 1981, in volume 21, issue 1-2, pages 209-262
Published in Malacologia, in 1981, in volume 21, issue 1-2, pages 263-289