We have found this shell previously at Port Canaveral, Brevard County, Florida. Recently, I found another at the Jupiter Inlet jetty (Palm Beach County). The following specimen is 4.5 mm in diameter across the base and 4 mm high from the base to the top of the upright; apertural diameter 0.9 mm. Note the encircling sculpture of distinct ridges that fade out on the upright section.

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Upon reviewing the above photos first Harry Lee and then Colin Redfern noted that this species has a distinctive cylindrical protoconch if I was to look closely at the base of the shell. So, here's what I found when I looked more closely. The first photo is the "tucked in" protoconch of another specimen from Jupiter Inlet. The second one is of a more extended specimen from Port Canaveral, Florida.