Strophiops (Umbonis) mutatoria Maynard and Clapp in Maynard, 1920

Original Description

5. S. mutatoria.

Smaller and more slender than 3, 1.00 by .26; lines of growth and sometimes low costae on ultimate whorl; mar­gin and lower tooth as in last, but there is a small upper tooth: color, similar. In area south of last. Map 1, 6. Common, 500, all dead. Plate 1. figs. 3 4.

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