720 GEOLOGY OF TUE YELLOWSTONE NATIONAL PARK. 



probal:)ly M. high'JkhU as exemplified from Greenland, the type locality. 

 As already pointed out, this species is also the closest relative of M. spedahUls, 

 which in turn is closely allied to M. foetida. It is possible that M. inglefieldi, 

 the earliest arctic representative, was pushed down by the invading- ice, 

 occupying under a slight variation (71/. spectabilis) the Yellowstone National 

 Park, and surviving at the present day as 31. fwtida. 



Habitat: Fossil Forest Ridge, bed No. 3, "Magnolia bed;" collected 

 by Ward and Knowlton, August, 1887. 



Magnolia mickophylla n. sp. 



Leaf thick, elliptical-lanceolate in outline, with slightly undulate entire 

 maro-in: midrib very thick, straight; secondaries 4 or 5 pairs, alternate, 

 very irregular, at an angle of 30° to 45°, much curved upward, forking 

 near the margin, the fork joined by the branch from the secondary next 

 below; intermediate secondaries present, irregular; nervilles irregular ; finer 

 nervation obscure. 



A single broken fragment is the only example of this species observed. 

 The part preserved is 6 cm. long and 4 cm. wide. 



This leaf was associated on the same piece of matrix with 31. speciahilis, 

 yet differs by the characters enumerated. 



Habitat: Fossil Forest Ridge, b^-d No. 3, "Magnolia bed;" collected 

 by Ward and Knowlton, August, 1887. 



Magnolia culver: n. sp. 



ri. xoii, fig. 5. 



Leaf large, membranaceous, broadly ovate, truncate at base, obtusely 

 pointed above; petiole short; midrib thin, straight; secondaries 6 or 7 

 pairs, alternate, at an angle of 40° or 45°, forking some distance below the 

 margin, camptodrome by broad loops; intermediate secondaries occasional, 

 soon lost in the middle area between the secondaries; nervilles numerous, 

 irregular, thin, broken; liner nervation producing large irregularly quad- 

 rangular areas. 



The specimen iigured, which is that best preserved, is 14 cm. in length, 

 including the petiole, but lacks the apex. It must have been some 15 cm. 

 long when perfect. It is broadest just below the middle, where it is 8 cm. 

 wide. The petiole is 1 cm. long and moderately thick. 



