The Fauna of the Pitkin Formation of Arkansas

W. H. Easton

1943

Article

Journal of Paleontology 17(2):125-154

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Taxa discussed in this work:

• Euomphalus triliris
• Euphemites incarinatus
• Helcionopsis reticulatus
• Ptychomphalina angulata

Taxonomy:

• Helcionopsis reticulatus belongs to Helcionopsis - Easton (1943)