MARYLAND GEOLOGICAL SURVEY 53 



Hay, 0. P. Eeptilia. 



Md. Geol. Surv., Pliocene and Pleistocene, pp. 169, 170, pi. xl, 1906. 



HoLLiCK, Arthur. Ptericlophyta, Spermatophyta. 



Md. Geol. Surv., Pliocene and Pleistocene, pp. 217-237, plates Ixvii-lxxv, 1906. 



Lucas, F. A. Mammalia. 



Md. Geol. Surv., Pliocene and Pleistocene, 157-169, plates xxxiv-xl, 1906. 



Sellards, E. it. Insecta. 



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



Shattuck, George Buebank. The Pliocene and Pleistocene De- 

 posits of Maryland. 



Md. Geol. Surv., Pliocene and Pleistocene, pp. 23-152, plates i-xxxi, 1900. 

 Shattuck, Geo. B., and Miller, B. L. 



St. Mar.v'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 Miocene of Maryland. 



Proc. U. S. Natl. Museum, vol. xxx, pp. 835-S40, plates Ixxv-lxxvi, 1906. 



Ulrich, E. 0. Molluscoidea. 



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



