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Excerpt from Supplementary Monograph on the Mollusca: From the Stonesfield Slate, Great Oolite, Forest Marble, and Cornbrash
Shell inflated, globose, variable in form throughout all the stages of its growth, orna mented with large, transverse, slightly elevated ribs, which pass from the umbilicus over the back to the other side, not straight, but curved forwards; these are separated by other shorter ribs, which alternate with the larger series of ribs in the adult state, but in the young state there are two and sometimes three short ribs between each of the longer ones. The volutions of the spire are irregular and embracing, forming a contracted um bilicus in the young state; subsequently the volutions are less contracted, which renders the shell unsymmetrical or deformed. The back is rounded, the mouth much contracted and prolonged in the middle part. The septa are very much complicated.
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