48 Art. 8. — A. Kryslitofovicli : 



the Magoihy Formation of Delaware and Maryland and also the 

 Raritan and Dakota. 



MONOCOTYLEDONES. 



On some plates of shale from several localities of different 

 horizons remains are seen, which are either grasses or sedges, all 

 too badly preserved for determination. 



DiCOTYLEDOKES. 



22. Fopulus arctica Heer. 



1868. Heer, Miocene Flora von Nordgrönland, F. F. A. vol. I, p. 100, 

 pi. IV, f. 6 a, 7 ; V ; VI, f. 5, 6 ; VIII, f. 5, 6 ; XVII, f. 5 b, c ; 

 p. 137, pi. pi. XXI, f. 14, 15. 



1869. Heer, Contributions to the fossil flora of North Greenland, F. F. A. 

 vol. II, p. 469, pi. XLIII, f 14 ; L, f 8 b ; LUI, f. 4 b. 



1870. Heer, Die Miocene Flora und Fauna Spitzbergens, ibidem, p. 55, pl. 

 X, f 2-7 ; XI, f. 1 ; XII, f 6c. 



1871. Lesquereux, Annual report, p. 289, 300. Supplement, p. 9. 



1872. Idem, Annual report, p. 358, 401. 



1873. Idem, Annual report, p. 406. 



1874. Heer, Nachträge zur Miocenen Flora Grönlands, F. F. A., vol. Ill, 

 part 8, p. 15, 17, 20, pl. II, f. 20 ; III, f. 9. 



1876. Heer, Beiträge zu foss. Flora Spitzbergens, F. F. A., vol. IV, p. 68, 

 pl. XXXI, f 2. 



1878. Lesquereux, Contributions to the fossil flora of the western Territo- 

 ries, The Tertiary Flora, p. 178, pl. XXIII, f 1-6. 



1878. Heer, Die Miocene Flora des Grinnell-Landes, F. F. x\., vol. V, p. 

 30, pl. V, f 1. 



1878. Heer, Primitœ florœ fossilis sachalinensis, F. F. A., vol. V, p. 26, 

 pl. II, f lb, III, f 3a. 



1878. Heer, Beiträge zur miocenen Flora von Sachalin, F. F. A., vol. V, 

 part 4, p. 4, x^l- I, f- 3, 4. 



