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land shells.

Simpson, (Chas. Torrey). The sleep of Mollusks.

[Popular Science Monthly vol. [[XIV?]], No. 1, pp 99-104, May, 1894.]

A popular paper on the subject indicated in the title.

Singley, (J.A.) Contributions to the Natural History of Texas. Part I, Texas Molluska.

[Fourth Annual Report, Texas Geol. Sur. pp.299-343, Sept. 1893. Separately printed].

A systematic list of the Mollusca of Texas with notes. The critical species were identified for Mr. Singley at the National Museum.