. Bulletin of the British Museum (Natural History), Geology. . Fig. 9. Areoligera undulata n. sp. Holotype. A. Ventral view ; the broken line indicates the margin of cyst body, the apical archaeopyle indicated by shading. B. Dorsal view. (3) ; AB44. The textural appearance of the membranes, and the variation in the type of process complex developed on the dorsal surface in A. undulata, are similar to those of A. sentosa n. sp. A few specimens have been recorded in which all the pre- and postcingular complexes are annular, while in some forms they are all arcuate. No forms have been rec
. Bulletin of the British Museum (Natural History), Geology. . Fig. 9. Areoligera undulata n. sp. Holotype. A. Ventral view ; the broken line indicates the margin of cyst body, the apical archaeopyle indicated by shading. B. Dorsal view. (3) ; AB44. The textural appearance of the membranes, and the variation in the type of process complex developed on the dorsal surface in A. undulata, are similar to those of A. sentosa n. sp. A few specimens have been recorded in which all the pre- and postcingular complexes are annular, while in some forms they are all arcuate. No forms have been recorded with process complexes developed on the ventral surface, although in one specimen there is some loss of proximal continuity in the membrane on the ventral surface. The undulating nature of the distal margin of the sail-like membranes and the absence of distal spines distinguish A. undulata from A. sentosa n. sp. and A. tauloma n. sp. Occurrence. Middle and Upper Eocene. Previous Record. Upper Eocene of East Prussia (Eisenack 1954, as Palmnickia sp. indet.). Genus AREOSPHAERIDIUM Eaton 1971a The genus and the three species so far assigned to it, mentioned below, have been fully described by Eaton (1971a). Areosphaeridium diktyoplokus (Klumpp) Eaton 1971a PL 6, fig. 2 x953 Hystrichosphaeridium diktyoplokus Klumpp : 392 ; pi. 18, figs 3-7. 1963b Cordosphaeridium diktyoplokus (Klumpp) Eisenack : 262 ; pi. 29, fig. 1. 1971a Areosphaeridium diktyoplokus (Klumpp) Eaton : 358 ; pi. 1, figs 3-8 ; pi. 2, figs 1-6. Occurrence. Lower, Middle and Upper Eocene. Previous Records. Lower Eocene of Belgium (De Coninck 1972*), of north Germany (Morgenroth 1966a) and of the Hampshire Basin in southern England (Eaton 1971a) ; Middle Eocene of north Germany (Klumpp 1953, Agelopoulos. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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