Bishop, G.A. (1983) Two new species of crabs, Notopocorystes (Eucorystes) eichhorni and Zygastrocarcinus griesi (Decapoda: Brachyura) from the Bearpaw Shale (Campanian) of north-central Montana. Journal of Paleontology57: 900–910.
Two new species of crabs, _Notopocorystes_ (_Eucorystes_) _eichhorni_ and _Zygastrocarcinus griesi_ (Decapoda: Brachyura) from the Bearpaw Shale (Campanian) of north-central Montana