720 GEOLOGY OF THE YELLO'WSTONE NATIONAL PARK. 



probably M. inglefieldi as exemplified from Greenland, the type locality. 

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

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

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

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

 Park, and surviving at the present day as M. fcetida. 



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

 by Ward and Knowlton, August, 1887. 



Magnolia miorophylla n. sp. 



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

 margin; 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. spectabilis, 

 yet differs by the characters enumerated. 



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

 by Ward and Knowlton, August, 1887. 



Magnolia culveri n. sp. 



PI. XC1I, 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 secondai'ies occasional, 

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

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

 rangular areas. 



The specimen figured, 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. 



