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Additional info for The palaeontology and stratigraphy of the lower part of the Upper Kimmeridge Clay of Dorset

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Upper Kimmeridgian, Wheatleyensis Zone (upper part), between 9 and 3 ft. below the Blackstone. DESCRIPTION. Large evolute shell with a diameter of 220 to approximately 230 mm. Diameter of umbilicus 110^115 mm. 73418) has 36 primary and approximately 104 secondary ribs on the last whorl (about oneeighth of a whorl is missing). At 50 mm. diameter this specimen has 57 ribs, at 60, 59; 70, 66; 80, 72; 90, 76; 100, 77; no, 78. The variation in rib density is shown in Text-fig. 5. The ribs on the inner whorls are fine and slender.

Nov. (PI. 23, figS. I, 2; PI. 24, fig. 2) DIAGNOSIS. Macroconchs 150-195 mm. in diameter with following rib densities: at 20 mm. diameter there are 52-58 ribs; at 25, 55-60; 30,56-63; 35,60-65; 40, 62-67; 45, 65-71; 50, 68-74; 55, 70-76; 60, 73-77; 65, 75-79. Ribs of inner whorls slender and prorsiradiate. Outer whorl developing strengthened primary ribs, first with polygyrate and polyploke furcation, then with tendency to virgatotome furcation. Microconchs 77-110 mm. diameter with following rib densities: at 20 mm.

The horn itself is ornamented only by growth lines, the ribs on the whorl-side fading as they approach the venter in the vicinity of the horn. REMARKS. This species is younger in age than other species of this subgenus recorded hitherto. It is distinguished by its rib-style, particularly the tendency for the ribs of the macroconch to be slightly rursiradiate. The microconch horn also tends to be free of ornamentation. g. 73402 figured in PI. 2, fig. 3) the venter bears scars, suggesting that earlier formed horns may have been shed.

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