Perisphinctes (Prososphinctes)
Species
Perisphinctes (Prososphinctes)? sp.
Based on one small specimen
Occurrence: Swift Formation of Little Rocky Mountains in Montana
Reference: Imlay, 1982
![Specimen Photo](PrososphinctesSp.jpg)
Perisphinctes (Prososphinctes)? sp.
Photograph from Imlay, 1982