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Perisphinctes (perisphinctes) variocostatus

Perisphinctes (perisphinctes) variocostatus

SKU: OXF 25.0A
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One side and the venter of a very fine large adult with 8 beautifully preserved whorls. Sutures including the last are visible and 90 mm of body chamber is present. Test is present on the inner 7 whorls. The variation in ribbing from which the specific name is derived shows particularly well - smooth on the inner two whorls, fine and strongly prosiradiate on the next 2 whorls, then less prosiradiate though still dense till the last 1/4 whorl of the phragmocone, where there is a dramatic increase in strength and spacing of ribs which continues on the body chamber. From England, UK.

Size: 235mm diameter