DESCRIPTION OF SPECIES. 199 



The species is related to M. Inglefieldi Heer of the Tertiary of Green- 

 land, as figured iu Fl. Foss. Arct, vol 7, p. 121, PI. lxix. Fig. 1; PI. lxxxv, 

 Fig. 3; PI. Lxxxyi, Fig. 9, which differs by the secondaries branching and 

 curving nearer to the borders, slightly more open in the lower part of the 

 leaves and continuing in size and direction to the basal border, the lower 

 pair being more oblique and running upward as a marginal nerve. The 

 real or more marked affinity of the Cretaceous leaf is with those of the 

 living M. amhrclla Lam., the leaves of which are thin, nearly of the same 

 size and form as those of the Dakota Group, and liave a nervation really 

 identical, the secondaries passing in the lower part of the leaves to short 

 tertiaries or nervilles nearly at right angles, while upward the secondaries 

 are forked above the middle and have the branches anastomosing in double 

 rows along the borders as in the fossil species. 



Habitat: Kansas. No. 780 of the Museum of Comparative Zoolog}' 

 of Cambridge, Massachusetts. 



Magnolia pseudoacuminata, sp. nov. 

 PI. XXIV, Fig. 2. 



Leaves subcoriaceous, of medium size, entire, short petioled, broadly 

 ovate-lanceolate, narrowed in curving to the petiole, decurring to it at, the 

 base, more gradually attenuated upward to the apex, subacuminate ; median 

 nerve strong and straight, not thick; secondaries parallel, more distant 

 in the middle and upper part of the leaf, ramose near the borders, campto- 

 drome. 



The leaves average 12*^™ in length and nearly 6™' in width at the mid- 

 dle, and the petiole preserved entire is 13°"" long. The secondaries, of 

 which there are twelve pairs, diverge 3.5° to 40° from the median nerve 

 and all preserve the same degree of obliquity. A few of them are more 

 distant and separated by thinner and shorter tertiaries and the areas are 

 traversed by flexuous, thin nervilles somewhat oblique to the secondaries. 



These leaves have the nervation and the form of those of the living 

 M. acuminata L., the well known cucumber tree. Indeed, they are so 

 remarkably similar to the small leaves of this species that no difference of 

 characters is observable. Compared to M. CapelUnii Heer,' Avhich is one 

 the best of the numerous leaves figured of the species, the base is not as 

 widely decurring in M. pseudoacmninata but attenuated in rounding to t]i(> 

 very short slightly decurring base. The leaves figured by Heer in tlie 



' Fl. Fobs. Arct., vol. Z, pt. 2, PI. xxxiii, Fig. 3. 



