462 STSTEikiATic Paleontology 



difolms^ and Aristolodiia Davecmana^ The latter form is midoiibtedly 

 congeneric with the Patapsco species but it is extremely doubtful if 

 Aristolochia is even as near an expression of its generic affinities as Popu- 

 lopTiyllum. The present species should also be compared with the Kome 

 plant which Heer described as ProtorMpis cor data ^ which is obviously 

 not a ProtorMpis and^ closely related to this Patapsco species. 



Occurrence. — Patapsco Formation. Mt. Vernon, 72-mile post near 

 Brooke, White House Bluff, near Widewater, just north of Aquia Creek 

 on the E. P. & P. E. E. and just south of Aquia Creek on the E. P. & 

 P. E. E. (common), Virginia; near Wellhams, Anne Arundel County, 

 Maryland. 



Collections. — U. S. National Museum, Johns Hopkins University. 



Order RANALES 

 Family NYMPHAEACEAE 



Genus NELUMBITES gen. nov. 



The Potomac forms referred to this genus have hitherto been referred 

 to Menispermites a comprehensive genus belonging to the allied family 

 Menispermacese of this order. 



The oldest species of Nelumio-like leaves heretofore known include' 

 the small leafed Nelumho primceva Berry * from the Magothy formation 

 of New Jersey and Maryland which should probably be referred to this 

 genus and the large leafed Nelumho Kempii Hollick^ from the same 

 formation in New Jersey and on Long Island and Marthas Vineyard. 

 Small leafed forms also occur at higher horizons in the Montana Group 

 and in the Laramie or Shoshone Groups of the West. Still other and 

 mostly larger species are referred to the allied genus Nelumhium of 

 Jussieu. 



^ Saporta, Fl. Foss. Portugal, 1894, p. 191, pi. xxxv, fig. 7. 

 ^ Saporta, Ibid., p, 183, pi. xxxv, fig. 10. 



^ Heer, Fl. Foss. Arct., Band vi, Abth. ii, 1880, p. 10, pi. iii, fig. 11. 

 * Bull. N. Y. Bot. Garden, vol. iii, 1903, p. 75, pi. xliii, fig. 1. 

 ^Mon. U. S. Geol. Surv., vol. 1, 1907, p. 61, pi. xiii, figs. 1-4; pi. xiv, figs. 1, 2; 

 pi. XV ; pi. xvi, figs. 1-6. 



