680 GEOLOGY OP THE YELLOWSTONE NATIONAL PARK. 



leaves, about 1 mm. broad and at least 8 cm. in length. They appear to 

 have been ribbed, or at least not terete in cross section. In no case has the 

 point or base of the leaves been observed, but from the fact that two leaves 

 seem to be found side by side, it seems quite probable that they were 

 arranged in twos, as in the living Pinus eclulis Engel., P. contorta Dough, etc. 



These leaves have a more or less close resemblance to certain described 

 species, but they are too indistinct and poorly characterized to make any 

 comparison valuable. 



Habitat: Fossil Forest Ridge, Yellowstone National Park, bed No. 4, 

 "Aralia bed;" altitude about 8,175 feet; collected by Lester F. Ward and 

 F. H. Knowlton, August 20, 1887. 



Pinus iddingst n. sp. 

 PI. LXXXII, tigs. 8, 9. 



Leaves linear, very long, teretish, ribbed, in bundles of three, sheath 

 obscure, but apparently short. 



The collection contains a number of needle-shaped leaves that without 

 doubt belong to Pinus. They are about 2 mm. broad and at least 13 cm. 

 long, but none are preserved entire. They appear to be associated in threes, 

 and in one case (see fig. 8) the upper portion of a sheath is preserved with 

 three leaves arising out of it. As near as can be made out, the leaves are 

 round on one side and flat and channeled on the other. 



1 have named this species in honor of Prof. Joseph P. Iddings, the 

 collector. 



Habitat: Andesitic breccia near gulch northwest of peak west of Dun- 

 raven; collected by Joseph P. Iddings, September 12, 1883. 



Taxites olriki Heer. 

 PI. LXXXII, figs. 1,4, 5. 



Several specimens of this fine species were found. The3 T agree closely 

 with the figures given by Heer 1 of specimens from Atanekerdluk, Greenland. 



Habitat: Walls of the canyon of Yellowstone River above mouth, of 

 Hellroaring Creek, Yellowstone National Park; collected by Walter Harvey 

 Weed, October 13, 1887. (Field No., 2961.) 



1 Fl. Foss. Arct., Vol. I, p. 95, PI. I, figs. 21-24c. 



