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Isolated Calcisphaerulidae from DSDP sections have previously been reported from the Indian Ocean Leg 27, from which Jurassic, Lower and Upper Cretaceous species were described and illustrated by the SEM method (Bolli, 1974), and from the Antarctic Leg 35, where for the first time Paleocene species were described and illustrated by Rögl (1976). Of the six sites drilled during Leg 40, Calcisphaerulidae were present in Sites 361, 363, and 364 (Figure 1). Only rare and poorly preserved specimens {Pithonella ? sphaerica) were obtained from the Cape Basin Site 361, where they occur in the Lower Cretaceous sapropels from Core 32 down. Calcisphaerulidae are much more frequent and better preserved in the Lower Cretaceous Cores 26 to 39 of the Walvis Ridge Site 363. In this site they are present, though only rare, in the Upper Cretaceous (Samples 182, 42-44 cm to Core 22) and in the Paleocene (Samples 18-1, 52-54 cm to 18-2, 34-38 cm). Rare Calcisphaerulidae of Pithonella sphaerica aspect occur in the Coniacian-Santonian Core 19 of Site 364 in the Angola Basin. Attention in this report is focussed entirely on the Site 363 Calcisphaerulidae which are described and illustrated in some detail, and whose stratigraphic distribution and significance is discussed. The specimens illustrated on Plates 1-7 are deposited in the Museum of Natural History, Basel, Switzerland, under the numbers C 33949 to C 33990. The number for each specimen appears with the species explanations for the plates.

Cretaceous and Paleogene Calcisphaerulidae from DSDP Leg 40, Southeastern Atlantic