. Bulletin of the British Museum (Natural History), Geology. FROM GREAT BRITAIN AND FRANCE 253 Cingulum narrow, helicoid, laevorotatory ; sulcus of moderate breadth. Shell surface densely granular. Large precingular archaeopyle formed by loss of plate 3". Holotype. BM(NH) slide ¥.53968(1). Clay from the base of the Calcaires de Moulin Wibert, south side of Cap de La Creche, Boulonnais (CC 448). Dimensions. Holotype : overall length 70 fi, breadth 50 n ; horn length 8 n ; breadth of the cingulum 5-8 //. Range (5 specimens measured) : overall length 70-80 ft, breadth 50-65 /x ; horn length
. Bulletin of the British Museum (Natural History), Geology. FROM GREAT BRITAIN AND FRANCE 253 Cingulum narrow, helicoid, laevorotatory ; sulcus of moderate breadth. Shell surface densely granular. Large precingular archaeopyle formed by loss of plate 3". Holotype. BM(NH) slide ¥.53968(1). Clay from the base of the Calcaires de Moulin Wibert, south side of Cap de La Creche, Boulonnais (CC 448). Dimensions. Holotype : overall length 70 fi, breadth 50 n ; horn length 8 n ; breadth of the cingulum 5-8 //. Range (5 specimens measured) : overall length 70-80 ft, breadth 50-65 /x ; horn length 6-9 \ Description. The shell is broadly ovoidal, giving rise to a strong apical horn ; this is formed by three of the four apical plates (plates 1', 2' and 4'). Apical plates i' and 4' are larger than the other two plates ; 1' is elongate. The single anterior inter- calary plate ia is large and located between the apical plates 3', 4' and precingular. 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)
Size: 1348px × 1853px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
