MARYLAND GEOLOGICAL SURVEY 53 



Sellards, E. II. Insecta. 



Md. Geol. Surv., Pliocene and Pleistocene, pp. 170-172, pi. xl, 1906. 



SiiATTUCK, George Burba xk. The Pliocene and Pleistocene De- 

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Md. Geol. Surv., Pliocene and Pleistocene, pp. 23-152, plates i-xxxi, 1906. 



SiiATTUCK, Geo. B., and ^Miller, B. L. 



St. Mary's Folio. 



U. S. Geol. Surv. Geol. Atlas, folio No. 136, Washington, 1906. 



True, Frederick W. Description of a new genus and species of 

 fossil seal from the j\[ioccne of Maryland. 



Proc. U. S. Natl. Museum, vol. xxx, pp. 835-840, plates Ixxv-lxxvi, 1906. 



Ulrich, E. 0. j\Iolluscoidea. 



Md. Geol. Surv., Pliocene and Pleistocene, pp. 210-212, fig. 10, 1906. 



