. Bulletin of the British Museum (Natural History), Geology. FROM ENGLAND, SCOTLAND AND FRANCE 203 1964 G. perforans Cookson & Eisenack; Sarjeant, table 2. 1964 G. pevfovans Cookson & Eisenack; Eisenack, 397-8- 1965 G. perforans Cookson & Eisenack; Baltes, 12, pi. 3, figs 93-4. 1966 Gonyaulacysta perforans (Cookson & Eisenack); Sarjeant, nomen nudum, 131. 1967b Gonyaulax perforans Cookson & Eisenack; Vozzhennikova, table 12. 1967 G. perforans Cookson & Eisenack; Millioud, pi. 2, fig. 15; text-fig. i. 1969 G. perforans Cookson & Eisenack; Baltes, fig. 3. 1969 Gonyaul
. Bulletin of the British Museum (Natural History), Geology. FROM ENGLAND, SCOTLAND AND FRANCE 203 1964 G. perforans Cookson & Eisenack; Sarjeant, table 2. 1964 G. pevfovans Cookson & Eisenack; Eisenack, 397-8- 1965 G. perforans Cookson & Eisenack; Baltes, 12, pi. 3, figs 93-4. 1966 Gonyaulacysta perforans (Cookson & Eisenack); Sarjeant, nomen nudum, 131. 1967b Gonyaulax perforans Cookson & Eisenack; Vozzhennikova, table 12. 1967 G. perforans Cookson & Eisenack; Millioud, pi. 2, fig. 15; text-fig. i. 1969 G. perforans Cookson & Eisenack; Baltes, fig. 3. 1969 Gonyaulacysta perforans (Cookson & Eisenack); Sarjeant, 10. Description: The cyst is elongate, with a long apical horn. The epitract and hypotract are separated by the helicoid, laevorotatory cingulum and are more or less equal in size. Tabulation: 4', 6", 6'", ip and i"". Plate boundaries are demarcated by membraneous, delicate porate crests, which are well developed around the apex and the antapex. The sulcus is long and narrow, extending from apex to antapex. The shell wall is thin, the surface granular and occasionally perforate. An archaeopyle was rarely observed; when developed, it forms by the loss of plate 3".. 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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