Abstract
De Folin (1886), described, from the bathyal and abyssal north-east Atlantic, 10 new species belonging to Bathysiphon, a genus of large agglutinated foraminiferans. In the present paper, eight of these species are revised on the basis of material in the de Folin collection at Biarritz, France, and new material collected by the Institute of Oceanographic Sciences. Lectotypes are established for six species: B. capbritonensis de Folin, B. capillare de Folin, B. flavidus de Folin, B. major de Folin, B. rufus de Folin and B. strictus de Folin. Bathysiphon nitens de Folin is shown to be a synonym of B. capillare and B. echinatus a probable synonym of Saccorhiza ramosa Brady. The available material does not help to clarify the nature of the ninth species, B. subvitreus de Folin. The remaining species established by de Folin, B. rusticus de Folin, was redescribed in an earlier publication.
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