. Bulletin of the British Museum (Natural History), Geology. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 123 expresses doubt as to which is correct ; he comments on the difficulty of distinguish- ing crests from folds. The tabulation presented in Eisenack's Text-fig. 3 agrees closely with that determined from the English specimens. The plate here designated as postcingular plate i'" is figured, but not numbered ; Eisenack's plates i'" to 6'" thus correspond to plates 2'" to 7'" of the scheme here adopted. The presence of anterior and posterior intercalary plates is con
. Bulletin of the British Museum (Natural History), Geology. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 123 expresses doubt as to which is correct ; he comments on the difficulty of distinguish- ing crests from folds. The tabulation presented in Eisenack's Text-fig. 3 agrees closely with that determined from the English specimens. The plate here designated as postcingular plate i'" is figured, but not numbered ; Eisenack's plates i'" to 6'" thus correspond to plates 2'" to 7'" of the scheme here adopted. The presence of anterior and posterior intercalary plates is confirmed. Gonyaulacysta orthoceras (Eisenack 1958) is an abundant and characteristic Cretaceous species, having a known range from Upper Valanginian to Turonian. It is clearly distinguishable through its combination of shape, tabulation, and nature of crests : comparisons with other described species are discussed by Eisenack (1958 : 389) and Gorka (1963 : 31). Gonyaulacysta aichmetes sp. nov. PL 13, figs. 5, 6 ; Text-fig. 30 Derivation of name. Greek, aichmetes, spearman, warrior ; referring to the pronounced apical 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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