A very fine adult internal mould with some patches of test, fully developed on both sides, showing 5 whorls. Sutures including the last are visible, the last few are approximated and the body chamber which is almost complete, occupies half a whorl, shows uncoiling of the umbilical seam over the last 1/4 whorl and has a terminal constriction. The ribbing shows well on the inner whorls, fades over the last whorl and the last part of the body chamber is almost smooth. A strong keel is present. About 1/3 whorl of the phragmocone is fortuitously missing, enabling the inner whorls to be seen well and compared with the microconch, with which it corresponds very closely. From glacial drift derived from the Ampthill Clay of eastern England.
Size: 106 mm
Size: 106 mm