W. Healey Dall and Ochsner, W. Henry, ?Landshells of the Galapagos Islands?, Proceedings of the California Academy of Sciences, Fourth Series, vol. 17, pp. 141?185, pl. 8?9, 1928.

W. Healey Dall, ?On some types new to the fauna of the Galapagos Islands?, The Nautilus, vol. 5, pp. 97?99, 1892.

W. Healey Dall, ?Preliminary notice of new species of land-shells from the Galapagos Islands, collected by Dr. G. Baur?, The Nautilus, vol. 7, pp. 52?56, 1893.

W. Healey Dall, ?New species of land-shells from the Galapagos Islands?, The Nautilus, vol. 8, pp. 126?127, 1895.

W. Healey Dall, ?New species of \textit{Bulimulus from Galapagos and Peru?, Proceedings of the Biological Society of Washington, vol. 30, pp. 9?12, 1917.

W. Healey Dall, ?Preliminary descriptions of new species of Pulmonata from the Galapagos Islands?, 4, vol. 2, pp. 375?382, 1917.

W. Healey Dall, ?On the relations of the sectional groups of \textit{Bulimulus of the subgenus \textit{Naesiotus Albers?, Journal of the Washington Academy of Sciences, vol. 10, pp. 117?122, 1920.

W. Healey Dall, ?Additions to the insular land-shell faunas of the Pacific coast, especially of the Galapagos and Cocos Islands?, Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 52, pp. 88?106, pl. 8, 1900.

W. Healey Dall, ?Insular landshell faunas, especially as illustrated by the data obtained by Dr. G. Baur in the Galapagos Islands?, Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 48, pp. 395?460, pl. 15?17, 1896.