Thanks to Kevin Durney for the indentification
General abundance: Rare
I think the specimen is remarkable for its intactness.
Usually if you find one specimen in seven years, it is
a partial, and just a tantalizing hint that you have to
dig longer to find the complete specimens. To find a
complete Proetid is a stroke of great luck.
Dr. Sam M. Gon III
A field guide to Fossils of Texas (plate 75)
Phylum Arthropoda (trilobites)