. Bulletin of the British Museum (Natural History), Geology. FROM GREAT BRITAIN AND FRANCE 257 Description. Shell subspherical to elongate, with a long apical horn. Tabula- tion : 4', 6", 6c, 6" ', 1" ". Cingulum narrow and laevorotatory, dividing the shell into two unequal parts : epitract longer than the hypotract. Plate boundaries spiny ; spines short, solid and distally acute or blunt. Precingular archaeopyle forms by loss of the plate 3". Surface densely granular. Figured specimen. BM(NH) slide ¥.53972(1). Clay from top of the Gres de Chatillon, south of Audressel
. Bulletin of the British Museum (Natural History), Geology. FROM GREAT BRITAIN AND FRANCE 257 Description. Shell subspherical to elongate, with a long apical horn. Tabula- tion : 4', 6", 6c, 6" ', 1" ". Cingulum narrow and laevorotatory, dividing the shell into two unequal parts : epitract longer than the hypotract. Plate boundaries spiny ; spines short, solid and distally acute or blunt. Precingular archaeopyle forms by loss of the plate 3". Surface densely granular. Figured specimen. BM(NH) slide ¥.53972(1). Clay from top of the Gres de Chatillon, south of Audresselles, Boulonnais (CC 450). Dimensions. Figured specimen : overall length 73 /a, breadth 65 /u. ; horn length 8 /x ; length of the spines 1-3 /x. Range of the English specimens (15 specimens measured) : overall length 65-73 /*, breadth 50-75 it. French specimens (25 speci- mens measured) : overall length 68-72 /x, breadth 60-65 ^. German specimens :. 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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