Publication
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Studies on neotropical Collembola, II. A new Ceratophysella from Guatemala Article
Beaufortia, 15(192), 89-94.January 1968
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Flabellina engeli, a new nudibranch from Curaçao Article
Beaufortia, 15(200), 139-142.January 1968
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Revision of the genus Aponogeton (Aponogetonaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 16(1), 243-265.January 1968
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Bipalium engeli n. sp., a terrestrial triclad from Singapore Article
Beaufortia, 15(194), 105-107.January 1968
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Dr. Hendrik Engel. Zoologist and Historian, Curator and Professor Article
Beaufortia, 15(179), 1-5.January 1968
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Copepoda endoparasitic of tropical holothurians Article
Bulletin Zoologisch Museum, 1(9), 89-105.January 1968
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A synopsis of the genus Enicostema Bl., nom. cons. (Gentianaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 16(1), 133-136.January 1968
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The littoral environment of rocky shores as a border between the sea and the land and between the sea and the fresh water Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 16(2), 375-393.January 1968