. Bulletin of the British Museum (Natural History), Geology. 3°4 DINOFLAGELLATE CYSTS AND ACRITARCHS. Fig. 29. Psaligonyaulax apaleta (Cookson & Eisenack). A specimen from the basal Kimmeridgian of Osmington Mills. X c. 850. Figured specimen. BM(NH) slide ¥.52804(1). Clay from 15 ft. above the Ringstead Coral Bed, west of Osmington Mills, Dorset (OM 419). Dimensions. Figured specimen : overall length 87 n, breadth 50 y. ; endoblast length 55 n, breadth 50 /x. Range of the English specimens (9 specimens measured) : overall length 75-105 //., breadth 35-53 /x ; endoblast length 48-68 /x, bre
. Bulletin of the British Museum (Natural History), Geology. 3°4 DINOFLAGELLATE CYSTS AND ACRITARCHS. Fig. 29. Psaligonyaulax apaleta (Cookson & Eisenack). A specimen from the basal Kimmeridgian of Osmington Mills. X c. 850. Figured specimen. BM(NH) slide ¥.52804(1). Clay from 15 ft. above the Ringstead Coral Bed, west of Osmington Mills, Dorset (OM 419). Dimensions. Figured specimen : overall length 87 n, breadth 50 y. ; endoblast length 55 n, breadth 50 /x. Range of the English specimens (9 specimens measured) : overall length 75-105 //., breadth 35-53 /x ; endoblast length 48-68 /x, breadth 35-53 xx. French specimens (5 specimens measured) : overall length 70-100 /x, breadth 37-6011 ; endoblast length 45-65 /x, breadth 30-58 /x. Holotype dimensions (as quoted by Cookson and Eisenack) : overall length 120 ti, breadth 58 xx ; endoblast length 80 it, breadth 58 11. The Australian specimen is thus larger than the European specimens. Remarks. P. apaleta has previously been recorded from the Oxfordian to Lower Kimmeridgian of Australia and New Guinea. It was observed in the assemblages from Dorset, Stretham, Normandy and the Boulonnais, but it was not observed in the Scottish material. Psaligonyaulax sp. (PI. 3, fig. 6 ; Text-fig. 30) Description. The elongate shell bears an apical horn which is formed by the periphragm only. There is no determinable tabulation. A large precingular archaeopyle is present on the dorsal side. The surface of the shell is smooth. Figured specimen. BM(NH) slide ¥.53956(3). Clay from 20 ft. above the Ringstead Coral Bed, Osmington Mills, Dorset (OM 420).. 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 British Museum (Natural History). London : BM(NH)
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