Old d, I looked at those in my book but ruled them out, now I am thinking Leperditia? or Cyzucus. Better resemblance. I will try to get better picture. I also found tiny white circles that look similar to present day barnacles. I can't get a good enough pic to enlarge it where they can be seen. Maybe I will take it to the college & see if they could take a pic for me, & help ID. I love the mystery of it all.