742 GEOLOGY OF THE YELLOWSTONE ]S"AT10:NAL PAKK. 



STERCULIACE.!:. 



Pterospermites hauuei n. sp. 

 PI. XCIX. tio. 4. 



Leaf t)t' tiriii textuiv, lir(>aill\' oIjIohj;- in outline, slightly inaMjuilateral, 

 truncate at l)a.se, obtusely pointeil at apex; marg-in, except at base, irregu- 

 lai-ly serrate, the teeth small, sharp, ujiwanl pointing; midrib strong, 

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

 craspedodrome, or subcamptodrome, with liranclies outside entering the 

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

 strt)ng, mainly broken; liner nervation not preserved. 



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

 broad. As stated, it is (piite regularly bron(l-ol)long in shape, with sparsely 

 toothed margins except near the base. 'Hie lower ])air of secondaries form 

 a series of Ijroad loops, while the upper ones are maiidy cras])edodrome. 



This species is evideutlv ipiite closely relateil to P. minor Ward^ from 

 the Fort Uuicm grouj) near the mouth of the Yellowstone. Fig. 2 (loc. cit.) 

 is especially like this species, Imt differs in l)eing liardh' 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 Kidge; collect(*(l Ijy Arnold Hague (No. 1211)). 



CREDNERIACE.E. 



Credneria! pachvphvlla n. sp. 

 PL GI, ti--. (J. 



Leaf larue, thick, round-ovate, ronudcil and truncate or very slightly 

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

 coarsely sinuate-toothed; petiole long (4.") 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 tbe Laramie ¥[., p. ifi, PI. XLII, tig-. 1-;?. 



