Argillochelys cuniceps
A. cuniceps like P camperi is a relatively common turtle and fragments can be found in the pyrite accumulations on the beach, but to find a whole skull or carapace is again, extremely rare.
Three views of a skull, note the palette definition. Similar to P. crassicostatus but more deeply ridged.
Upper and lower view of an almost complete carapace

 

upper and lower view of a carapace, this time more wear is evident, especially to the upper side of the carapace