Arkell WJ, Moore RC, Miller AK, Furnish WM, Schindewolf OH. Part L, Mollusca 4, ch. 2, p. 129-205. InvertebratePaleo [Internet]. 1957 Jan. 1 [cited 2024 Aug. 24];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5265