Knight JB, Keen AM, Yochelson EL, Cox LR, Robertson R, Batten RL. Part I, Mollusca 1, ch. 3, p. 185-311. InvertebratePaleo [Internet]. 1960 Jan. 1 [cited 2024 Apr. 28];. Available from: https://journals.ku.edu/InvertebratePaleo/article/view/5585