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Four papers: The non-marine molluscs of Surinam (46 p., 2 pls) / The land- and freshwater-molluscs of the Dutch West-Indian Islands / On some land shells from New Guinea and neighbouring islands, with descriptions of two new species and a new variety / On two forms of Amphidromus semifrenatus.
1913-1914 46, 13, 8, 2 p., 2 figures, 2, 1 plates, disbound (no covers). All published in: Notes from the Leyden Museum.
Porifera of the Siboga Expedition. 1. The genus Placospongia. 2. The genus Spirastrella.
1902-1911 2 parts. 17, 69 p., 5, 14 pls, roy. 4to, paperbound. Part 1 partly loose.
