Maryland Geological Survey 53 



Ward, Lester F. Fossil cycadean trunks of North America, with a 

 revision of the genus Cycadeoidea Buckland. 

 Proc. Biol. Soc. Wash., vol. ix, 1894, pp. 75-88. 



. Eecent discoveries of cycadean trunks in the Potomac forma- 

 tion of Maryland. 



Bull. Torrey Club, vol. xxi, 1894, pp. 291-299. 



1895 

 BiBBiNS, Arthur. Notes on the paleontology of the Potomac forma- 

 tion. 



Johns Hopkins Univ. Circ, vol. xv, No. 121, 1895, pp. 17-20, 1 pi. 



Knov^^lton, F. H. The oldest dicotyledons. 



Popular Science News, vol. xxix, 1895, pp. 49-51, 66-68, 20 text figs. 



Lyman, Benjamin Smith. Report on the New Eed of Bucks and 

 Montgomery Counties. 



Pa. State Geol. Summ. Final Rept., vol. iii, pt. 2, 1895, pp. 2634-2635. 



Ward, Lester F. The Mesozoic flora of Portugal compared with that 

 of the United States. 



Science, N. S., vol. i, 1895, pp. 337-346. 



. The Potomac Formation. 



Fifteenth Ann. Rep. U. S. Geol. Surv., 1895, pp. 307-397, pis. ii-iv. 



1896 

 Darton, N. H. Artesian Well Prospects in the Atlantic Coastal Plain 

 Eegion. 



Bull. U. S. Geol. Surv. No. 138, 1896, 228 pp., 19 pi. 

 House Misc. Doc, 54th Cong., 2d sess., vol. — , No. 28. 



Fontaine, William Moeeis. The Potomac formation in Virginia. 

 Bull. U. S. Geol. Surv., No. 145, 1896, 149 pp., map. 



Gilbert, G. K. Age of the Potomac formation. 

 Science, N. S., vol. iv, 1896, pp. 87.5-877. 



Hill, Robert T. A question of classification. 

 Science, N. S., vol. iv, 1896, pp. 918-920. 



Marsh, 0. C. The dinosaurs of North America. 



Sixteenth Ann. Rept. U. S. Geol. Surv., pt. i, 1896, pp. 133-414, pis. ii-lxxxv. 



. The geology of Block Island. 



Am. Journ. Sci., 4th ser., vol. ii, 1896, pp. 295-298, 375-377. 



