. Bulletin of the British Museum (Natural History), Geology. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS '43 HOLOTYPE. Preparation No. A26, Geologisches Institut der Universitat, Tubing- en, Germany. Lower Cretaceous (Upper Barremian) ; Haverlahwiese, Germany. Material (figured). Geol. Surv. Colin, slide (4). Chalk, H. M. Geological Survey Borehole, Fetcham Mill, Surrey, at 840 feet depth. Upper Cretaceous (basal Cenomanian). Dimensions. Holotype : shell length 48[i., breadth 38[jl, length of processes i6-22[A. Range of German specimens : shell length 48-6o[x, breadth 38-56(1,, length o
. Bulletin of the British Museum (Natural History), Geology. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS '43 HOLOTYPE. Preparation No. A26, Geologisches Institut der Universitat, Tubing- en, Germany. Lower Cretaceous (Upper Barremian) ; Haverlahwiese, Germany. Material (figured). Geol. Surv. Colin, slide (4). Chalk, H. M. Geological Survey Borehole, Fetcham Mill, Surrey, at 840 feet depth. Upper Cretaceous (basal Cenomanian). Dimensions. Holotype : shell length 48[i., breadth 38[jl, length of processes i6-22[A. Range of German specimens : shell length 48-6o[x, breadth 38-56(1,, length of processes i6-36(jl. Specimen here figured : overall length (jt., breadth : shell length 62ji., breadth 45[jl. Description. This species occurs in low numbers in the assemblages from the Chalk at 840 and 810 feet depth (basal Cenomanian) in the Fetcham Mill bore. Although a number of specimens were available for study, the majority proved unsuitable as a result of distortion or unfortunate orientation : the figured specimen was the only one capable of full study. It was thus not possible to confirm details of the apical structure. Plate i' is elongate and corresponds to the apical prolongation of the sulcus. At least two other apical plates appear to be present : no anterior intercalary plate could be distinguished. Six precingular and six postcingular plates are present ; no posterior intercalary plate was distinguished. The antapex is occupied by a single plate. The cingulum forms a strong laevorotatory spiral whose two ends differ in antero- posterior position by three times its width. There appears to be no separation into cingular plates. The sulcus is narrow and extends to the Fig. 36. Heliodinium voigti Alberti. Tabulation. Left, ventral view right, dorsal view (plate 3" is missing). x c. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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