742 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



sterculiacej:. 



Pterospermites haguei n. sp. 

 PI. XCIX, fig. 4. 



Leaf of firm texture, broadly oblong in outline, slightly inequilateral, 

 truncate at base, obtusely pointed at apex; margin, except at base, irregu- 

 larly serrate, the teeth small, sharp, upward pointing; midrib strong, 

 flexuose; secondaries 6 pairs, alternate, at an angle of about 45°, flexuose, 

 craspedodrome, or subcamptodrome, with branches outside entering' the 

 teeth; lower pair of secondaries forming a series of broad loops; nervilles 

 strong, mainly broken; finer nervation not preserved. 



The figured specimen of this species is 11 cm. long and nearly 7 cm. 

 broad. As stated, it is cpiite regularly broad-oblong in shape, with sparsely 

 toothed margins except near the base. The lower pair of secondaries form 

 a series of broad loops, while the upper ones are mainly craspedodrome. 



This species is evidently quite closely related to P. minor Ward 1 from 

 the Fort Union group near the mouth of the Yellowstone. Fig. 2 (loc. cit.) 

 is especially like this species, but differs in being hardly half the size and 

 in being markedly heart-shaped at the base. It perhaps should be referred 

 to this species except for the fact that the other 2 leaves included by 

 Professor Ward are so very different that they can hardly be allied to the 

 one under discussion. 



Habitat: Fossil Forest Ridge; collected by Arnold Hague (No. 1219). 



(REDNERIACE.E. 



CREDNERIA ? PACHYPHYLLA \\. Sp. 



PL CI, tig-. <;. 



Leaf large, thick, round-ovate, rounded and truncate or very slightly 

 heart-shaped at base, abruptly acuminate at apex; margin apparently 

 coarsely sinuate-toothed; petiole long (4.5 cm.), thick (4 mm.); .midrib 

 thick, passing to the apex; secondaries 6 or 7 pairs, the 3 lower pairs (of 

 which the very lowest is slender and near the margin) opposite and arising 

 from almost the same point at the base of the blade, others alternate, all 



] Types of the Laramie PL, p. 95, PI. XLII, rig. 1-3. 



