Argillocheles antiqua
A. antiqua is an uncommon species. The skull is very similar to A. cuniceps and as such is very difficult to differentiate.
A unique specimen of an immature example of A. antiqua found on the beach cased in a phosphatic nodule. It took several weeks to prepare.

Found on the foreshore 30 Nov 2012 an almost complete carapace

Again an immature specimen