I straightened up my Riker show case of the Calceola (Rhizophylum) tennesseensis I've found in Wayne County TN. I have a few more and a couple more operculum (lids). Here's an article on pages 6 & 7 in this link: http://www.memphisgeology.org/images/rocknews1116.pdf?fbclid=IwAR2tOxbcyxSpHnOp5uRY6aW7DJUhvFmkQEmghhdSasT6_wNB40U8ptICOIY
Thanks for looking and Rock On!!