Publication Yen (1951): summary

Full Citation

Yen, T.-C. 1951. Fresh-water mollusks of Cretaceous Age from Montana and Wyoming. United States Geological Survey Professional Paper 233-A: 1-20. Available electronically.

Taxonomic Opinions

Protelliptio douglassi (Stanton)

Sulcatapex cretaceus Yen

Unio farri Stanton = Ligumia farri

Unio natosini McLearn = Quadrula natosini