FOSSIL FLORA. 679 



whole cone, approximately square (or, better, rhomboidal), 5 mm. in each 

 direction; each scale marked by a distinct umbo, and with a prominent 

 ridge along the lower part. 



The specimen described is also the only one observed. It is possible 

 that it may be the same as P. ffracilistrohus, as it comes from the same beds, 

 but it is nearly twice the size, and differs slightly in the character of the 

 scales and their markings. 



Neither the base nor the apex is preserved, and it is therefore impos- 

 sible to know the length, but there is a slight indication that the part 

 preserved is near the upper end, as it is slightly narrowed. This may, 

 however, be due to the poor state of preservation. 



As stated under P. ffracilistrohus, it is hardly worth while to attempt 

 working out affinities with such imperfect material. 



Habitat: Fossil Forest Ridge, Yellowstone National Park, bed No. 7, 

 "Castanea bed;" collected by Lester F. Ward and F. H. Knowlton, August 

 16-20, 1887.- 



PiNUS MACROLEPIS n. Sp. 

 PL LXXX, fig. IL 



Scales thick, spatulate, rounded above, slender below, with a raised 

 margin or rim. 



The m-ere fragment figured represents all that was found of this species. 

 It consists of portions of 9 scales, arranged in 4 spiral rows. They are 

 broadly spatulate, being rounded above and narrow below. The largest 

 one is 13 mm. in length, 6 mm. broad in the upper portion, and about 3 mm. 

 in the lower portion. The scales were thick and have a strong raised rim. 



There is every evidence that this was a large cone, but it is so frag- 

 mentary that nothing can be made out but the few scales. It is useless to 

 attempt to work out aftinities, except that it was probably a white pine. 



Habitat: Cliff' west of Fossil Forest Ridge, Yellowstone National Park; 

 collected by Lester F. Ward and F. H. Knowlton, August 15, 1887. 



PiNUS WAEDII n. sp. 



Leaves linear, long, apparently in twos, ribbed, not terete. 

 There are a considerable number of fragmentary specimens that seem 

 in all proliability to belong to this genus. They are slender, needle-like 



