. Bulletin of the British Museum (Natural History) Geology Supplement. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 137 Psaligonyaulax deflandrei sp. nov. PL 14, figs. 7, 8 ; Text-fig. 35 1964. Gonyaulax cassidata Eisenack & Cookson ; Cookson & Hughes : 42, pi. 5, fig. 11 only. Derivation of name. Named in honour of Professor Georges Deflandre, who has published fundamental studies of dinoflagellates in the French Upper Cretaceous between 1932 and the present. Diagnosis. A Psaligonyaulax having a spindle-shaped outline, truncated posteriorly, with ovoidal inner body. Apical pericoel sur
. Bulletin of the British Museum (Natural History) Geology Supplement. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 137 Psaligonyaulax deflandrei sp. nov. PL 14, figs. 7, 8 ; Text-fig. 35 1964. Gonyaulax cassidata Eisenack & Cookson ; Cookson & Hughes : 42, pi. 5, fig. 11 only. Derivation of name. Named in honour of Professor Georges Deflandre, who has published fundamental studies of dinoflagellates in the French Upper Cretaceous between 1932 and the present. Diagnosis. A Psaligonyaulax having a spindle-shaped outline, truncated posteriorly, with ovoidal inner body. Apical pericoel surmounted by bifid horn, antapical pericoel flattened. Tabulation 4', ia, 6", 6c, 6'", ip, 1"". Crests of moder- ate height with smooth or denticulate edges. Cingulum broad, strongly spiral : sulcus narrower but widening posteriorly. Surfaces of endophragm and periphragm smooth or only minutely granular : an irregular scatter of tubercles may be present on periphragm. Holotype. Geol. Surv. Colin, slide (i). Chalk, Geological Survey Borehole, Fetcham Mill, Surrey, at 730 feet depth. Upper Cretaceous (Cenomanian). Dimensions. Holotype : overall length 75[x, breadth 44^ ; length of inner body 35\i, breadth 40[x. Range of dimensions : overall lengths 72 to 82;x, breadths 43 to 6o[ 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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