Published in Proceedings of the California Academy of Sciences, in 1931, in volume 19, pages 217-397

Published in Proceedings of the California Academy of Sciences, in 1931, in volume 19, pages 399-410

Published in Proceedings of the California Academy of Sciences, in 1931, in volume 19, pages 411-482

Published in Proceedings of the California Academy of Sciences, in 1931, in volume 20, pages 1-7

Published in Proceedings of the California Academy of Sciences, in 1931, in volume 20, pages 9-104

Published in Proceedings of the California Academy of Sciences, in 1931, in volume 20, pages 105-128

Published in Proceedings of the California Academy of Sciences, in 1931, in volume 20, pages 135-160