. Bulletin of the British Museum (Natural History), Geology. FROM GREAT BRITAIN AND FRANCE 245 This species of Tenua has been recorded from the Upper Callovian (L. lamberti Zone) and Oxfordian in Europe. Well preserved specimens were observed in the base of Kimmeridgian. Figured specimen : BM(NH) slide ¥.52793(1). Shaly clay from immediately west of the slipway at Osmington Mills, Dorset (OM 131). Dimensions. Figured specimen : length 50 /*, breadth 40 /x ; length of the spines 6-8 /x. Range of the dimensions : English specimens length 40-70 xi, breadth 50 xi ; Scottish specimens length 35-40
. Bulletin of the British Museum (Natural History), Geology. FROM GREAT BRITAIN AND FRANCE 245 This species of Tenua has been recorded from the Upper Callovian (L. lamberti Zone) and Oxfordian in Europe. Well preserved specimens were observed in the base of Kimmeridgian. Figured specimen : BM(NH) slide ¥.52793(1). Shaly clay from immediately west of the slipway at Osmington Mills, Dorset (OM 131). Dimensions. Figured specimen : length 50 /*, breadth 40 /x ; length of the spines 6-8 /x. Range of the dimensions : English specimens length 40-70 xi, breadth 50 xi ; Scottish specimens length 35-40 xx, breadth 30-45 /x ; French specimens length 60 /x, breadth 50 /x. In all specimens, the length of the spines was 3-8 /x. 10 English, 1 French and 7 Scottish specimens were measured. Tenua sp. (PL 9, fig. 3 ; Text-fig. 3) Description. The spherical shell possesses spines that are uniformly distributed over the whole surface. These spines are very short, solid and conical. Neither tabulation nor longitudinal or transverse structure were seen. There is a large apical archaeopyle; however, the operculum remains attached on one side. Sur- face smooth between the spines. Spines are numerous, about 220. Figured specimen. BM(NH) slide (1). Shaly clay from the base of Kimmeridge Clay, Liostrea delta Bed, Osmington Mills, Dorset (OM 131). Dimensions. Overall length 50 /x, breadth 50 /x ; apex lacking length 43 it ; length of the spines 2 /x. Remarks. A single specimen was observed in the Dorset material, which is. 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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