Author: Umbgrove J.H.F..,
Title: Het genus Pellatispira in het Indo-Pacifische gebied
Description: 1928. In 8vo, recent wrappers, pp. 62 with 16 pls and 10 figs. Offprint from Wetensch. Meded., 10. In Dutch with English summary (Foraminifera, Nummulites]

Keywords: paleontology - fossils nummulites - foraminiferans