FLOEA OF THE DAKOTA GEOUP. 77 



pi. xi, fig. 1; the two lower lateral nerves turn outside toward the short 

 lobes, while the upper is evidently tending upward. 



Hab. — With the preceding in numerous specimens. A. C. Beckwith, 

 A. Lakes. One specimen also has been found in Kansas. 



Liriophyllum obcordatum, sp. nov. 



Leaf small, obovate, entire, narrowly deeply eniarginate at the top, gradually 

 narrowing to the petiole (broken); medial nerve narrow; lateral nerves at an acute 

 angle of divergence, alternate, cainptodrome. 



This leaf, 6 centimeters long and 3 broad above the middle, is cut 

 from the top to one-third of its length into two obtuse entire slightly 

 diverging lobes by the splitting of the medial nerve, as in the two pre- 

 ceding species. It is perfectly entire, gradually narrowed from above the 

 middle, or cuneiform to the base, with two pairs of alternate distant sec- 

 ondary nerves at an acute angle of divergence and curving in passing 

 toward the borders. The tertiary nervation and the areolation are totally 

 obsolete. 



Hab. — With the preceding. Rev. A. Lakes. 



Carpites liriophylli? sp. nov. 

 Plate XI, Fig. 5. 



An oblong seed 3 centimeters long, 7 millimeters broad in the middle, 

 narrowed and blunt at one end, acute at the other; irregularly obscurely 

 lineate on the surface. 



The reference of this fruit to Liriophyllum is hypothetical. The seed 

 was found on one of the specimens of 31. Beckwith, with leaves of L. 

 populoides. 



ANONACE^E. 



ANONA, Linn. 



A ii (i n a cretacea, sp. nov. 



Leaf lanceolate or oblong-lanceolate, gradually narrowed to a short flattened 

 petiole; medial nerve thick; secondary nerves open, nearly at right angles toward the 

 base, branching, cainptodrome. 



A fragment of leaf of which the lower half only is well preserved. It 

 is similar in its size, form, and venation to A. lignitum. Ung., "Syllog.," 



