Nucelospria pisiformis (?) brachiopod from the Waldron Shale
The small brachiopod below was purchased labelled as a Nucelospria pisiformis from the Waldron shale. I am not entirely familiar with the fauna of the Waldron shale, but this looks very similar to shells I see identified as Whitfieldella nitida. A quick review of the "Index Fossils of North America" by Shimer and Shrock (pg 331, pl. 126, 127) does indeed lend creedence to my suspicions.
The specimen above came from the Waldron shale in Indiana which is Silurian (Sheinwoodian to Homerian stage) in age.