. Bulletin of the British Museum (Natural History), Geology. 3°° DINOFLAGELLATE CYSTS AND ACRITARCHS Cyst-Family ENDOSCRINIAGEAE Vozzhennikova, emend. Sarjeant & Downie, 1966 Genus ENDOSCRINIUM Klement, emend. Vozzhennikova, 1967a Endoscrinium cf. campanula (Gocht) (PI. 5, figs. 9, 10 ; Text-fig. 27) Description. A broadly ovate theca with a blunt, broad apical horn. Tabula- tion : 4', 6" 6c, 5" ', ?ip, o" ". The crests are moderately high and irregularly perforated ; their distal edges are smooth. The cingulum forms a strong laevorota- tory spiral, dividing the theca i
. Bulletin of the British Museum (Natural History), Geology. 3°° DINOFLAGELLATE CYSTS AND ACRITARCHS Cyst-Family ENDOSCRINIAGEAE Vozzhennikova, emend. Sarjeant & Downie, 1966 Genus ENDOSCRINIUM Klement, emend. Vozzhennikova, 1967a Endoscrinium cf. campanula (Gocht) (PI. 5, figs. 9, 10 ; Text-fig. 27) Description. A broadly ovate theca with a blunt, broad apical horn. Tabula- tion : 4', 6" 6c, 5" ', ?ip, o" ". The crests are moderately high and irregularly perforated ; their distal edges are smooth. The cingulum forms a strong laevorota- tory spiral, dividing the theca into two more or less equal parts. The epitract is pyramidal, the hypotract hemispherical. An endoblast, of similar shape to the shell, is present. The well developed sulcus broadens markedly towards the antapex. The surface of the periphragm is granular. A precingular archaeopyle forms by loss of plate 3". Figured specimen. BM(NH) slide ¥.52795(1). Shelly clay from Liostrea delta Bed, west of Osmington Mills, Dorset (OM 131). Dimensions. Figured specimen : overall length 90 /x, breadth 85 xx ; endoblast length 76 fi, breadth 70 xi. Range of the English specimens (6 specimens measured) : overall length 75-96 xi, breadth 6O-85 /x ; endoblast length 50-78 xx, breadth 48-75 xi. French specimens (12 specimens measured) : overall length 78-105 /x, breadth 68- 82 xt ; endoblast length 55-75 xx, breadth 50-75 xx. Only one specimen from the Scottish material was observed and measured : overall length 93 xx, breadth 85 xt ; endoblast length 73 xx, breadth 65 xx. E. campanula holotype dimensions, as quoted by Gocht, are overall length 104 xx, breadth 91 xx. The basal Kimmeridgian specimens from France are of similar size to the holotype, but the Scottish and English specimens are a little 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 per
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