Published in Revue Suisse De Zoologie, in 1921, in volume 28, pages 221-341

Published in Revue Suisse de Zoologie, in 1921, in volume 28, pages 301-309

Published in Revue Suisse De Zoologie, in 1921, in volume 28, pages 311-356

Published in Revue Suisse De Zoologie, in 1921, in volume 28, pages 449-451

Published in Rev. suisse zool., in 1921, in volume 28, issue 17, pages 381-442