122 DESCRIPTION OF SPECIES 



Gymnogramma Haydenii, Lesqx. 



Plate XIX, Fig. 2. 

 "U. S. Geol. Rep.," vii, p. 59, pi. v, figi<. l-X 



The fragment represented here is tlie upper part of a large leaflet 

 having exactly the same specific characters. It has been figured, on 

 account of the locality, as a positive identification of Snake River and Yel- 

 lowstone Lake with the Laramie Group. 



Hab. — Golden. A. Lakes. 



PALMiE. 

 Oreotloxitcs plicatiis, sp. nov. 



Plate XVIII, Figs. 1-4. 



Leaves acute at both euds, deeply plicate leugtliwise iu uumerous rays converging 

 at the base and the apex, obscurely marked toward the base by a narrow medial nerve; 

 rays distinctly veined; primary nerves distinct, separated by 3 or 4 thin intermediate 

 ones. 



On account of the plicate lamina, the leaves are referable to palms, 

 and, as seen by figs. 2 and 3, they appear partly traversed by a narrow 

 rib, which would indicate the disposition of the leaves as simple; but 

 they are more probably lobes of a compound or palmately divided frond, 

 like those of Oreodoxia rcrjia of Cuba. In this last species the lobes 

 are much longer and comparatively narrower, connected near the base. 

 This disposition may have been the same for the fossil leaves, as the frag- 

 ments, figs. 2 and 3. appear as lacerated near the base, and therefore as 

 if they had been merely segments of a palmately divided frond. 



The fragments of leaves described as Ludoviopsis Geonomcefolia, Sap., 

 "Fl. de Sezanne," p. 339, pi. iv, fig. 1, are the only fossil plants to which 

 the species might be compared. If the midrib of fig. 2 was more dis- 

 tinctly marked and the rays flat, the likeness would be striking. Saporta's 

 species is referable to the Pandanece. It has not the truly plicate rays of 

 the palms. 



Hah. — Golden, Colorado. Found by Rev. A. Lakes. The specimens 

 belong to the Museum of Princeton College. 



