These are the last of the fossils that I have from the Devonian of Iowa. They are a couple of Cyrtina specimens with some strange growth patterns.I think they both come from the Lime Creek formation (Devonian, Givetian).
Pedicle valve (note the odd curving of the shell)
Pedicle valve (note the "twisted" look in the tip of the shell)
I think both of these specimens came from Nathan so thank you!