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155. ——. 1886. The Batrachian intercentrum. Amer. Nat., XX, 76, 175.

156. ——. 1886. Systematic catalogue of the species of vertebrates found in the Beds of the Permian Epoch of North America. Trans. Amer. Phil. Soc., XVI, 285-296, pls. ii-iii.

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158. —-. 1888. On the intercentrum of terrestrial vertebrates. Trans. Amer. Phil. Soc., XVI, 243-253, pl. I, 6 figs.

159. ——. 1888. The Ossicula Auditus of the Batrachia. Amer. Nat., XXII, 464-467, pl. vi.