18 THE PALEONTOLOGY OF MINNESOTA. 



[Magnolia, Dewalquea. 



MAGNOLIA ALTERNANS Hcpr. 



PLATE A, FIG. 9. 



Heer, Phitt. du Neb., p. SO, PI. Ill, f. 2-4; PL IV, f. 1, 2. Usqx., Cret. FL, p. 92, PL XVI11, f. 4. 

 Newby. Note* on Extinct Floras, p. 8, Illustr. PI. V, f. 6. 



Leaves subcoriaceous, elliptical, very entire, rounded at base in narrowing to the petiole ; 

 medial nerve deep and narrow ; secondary nerves at an acute angle of divergence, curved in 

 passing to the borders, camptodrome, separated by shorter, thinner veins. 



The leaves are variable in size and form, generally narrower, even acutely nar- 

 rowed at base, but also often rounded in the lower part. They are not rare in 

 the whole extent of the Dakota group, also found in Greenland. They are easily 

 known by their peculiar nervation, the secondary nerves being generally separated 

 by thinner, shorter tertiary ones, which, however, are not always distinguish- 

 able. The leaves vary in size from 8 to 10 cm. long, and from 2A to 5 cm. broad in 



the middle. The divergence of the lateral veins from the midrib is 35-40. 







Hab. North side of the Big Cottonwoocl river, near New Ulm, Minnesota. 

 .Miis. Beg. No. 5155 B. 



DEWALQUEA PRIMORDALIS, sp. nov. 



PLATE A, FIG. 10. 



Leaflet coriaceous, oblanceolate or gradually narrowed from below the apex to the base, 

 very entire ; borders incurved ; medial nerve thin, nearly equal its whole length ; lateral 

 nerves at unequal distance, very oblique, camptrodrome, the lower more or less curved, the 

 upper nearly straight. 



The genus Deivalquea was established by Saporta and Marion in Marnes 

 Hersiennes of Gelinden, p. 55, for plants which the authors refer to the Ranun- 

 culacece-Helleborece with the following characters : " Leaves coriaceous, petiolate, 

 pedately or palmately divided in 3, 5, 7 leaflets, either dentate on the borders or entire, 

 penni nerve, the secondary nerves more or less oblique, curving in areoles near the borders. " 



At first remains of species of this genus had been found only in the upper part 

 of the Cretaceous, the Senonian. Heer has lately described two species from Patoot 

 in Greenland, a formation somewhat more recent than that of the Dakota group, 

 but where a number of species of this formation are still found. 



The specimen from Minnesota represents only a leaflet or a lobe, but its char- 

 acters indicate its connection to a palmately divided leaf. It has a marked relation 

 to I), gelindensis Sap. and Mar., 1. c. p. 61, PI. IX, f. 3 b. Identity with this species 

 could even be admitted if the lateral nerves were not at a slightly more acute angle 

 of divergence in the American form, and also less curved in passing to the borders. 



